OPINION
ADAMS, Judge:
1 1 Mike Basford was under the rear axle of a semi-tractor truck, guiding u-bolts into place as part of repairing the suspension on the tractor when the tractor fell on him, allegedly causing injury. Basford sued Gray Manufacturing Co., Inc., alleging that the tractor fell because the floor lift which was used to elevate the tractor frame failed and that the lift was manufactured by Gray. According to Basford, the lift was defective and unreasonably dangerous, making Gray liable for his injuries under Manufacturers' Products Liability and negligence.
12 After some discovery, Gray requested summary judgment, attaching evidentiary materials which it said demonstrated Basford could not recover on Manufacturers' Products Liability or negligence. Basford responded with evidentiary materials of his own and argued that fact issues prevented summary judgment. The trial court agreed with Gray and entered judgment for Gray against Basford. Basford appeals.
STANDARD OF REVIEW
13 In addressing Basford's claim that summary adjudication was inappropriate, we must examine the pleadings, depositions, affidavits and other evidentiary materials submitted by the parties and affirm if there is no genuine issue as to any material fact and Gray was entitled to judgment as a matter of law. Perry v. Green, 1970 OK 70, 468 P.2d 483. All inferences and conclusions to be drawn from the evidentiary materials must be viewed in a light most favorable to Basford. Ross v. City of Shawnee, 1984 OK 43, 683 P.2d 535. We are limited to the issues actually presented below, as reflected by the record which was before the trial court rather than one that could have been assembled. Frey v. Independence Fire and Casualty Company, 1985 OK 25, 698 P.2d 17.
FACTS
I 4 Basford worked as a mechanic for Stin-son Truck and Trailer Repair. On the day in question, he and other mechanics were repairing the rear suspension on a semi-tractor truck. The repairs required the frame to be raised off of the rear axle to allow room for insertion of parts of the suspension, including leaf springs which were held together by u-bolts. The u-bolts are inserted after the leaf springs have been put in place, and the frame must be lowered gradually to allow the holes in the springs to line up and allow insertion of the open ends of the u-bolt. According to Basford, this process requires some person to be under the elevated frame to guide the ends of the u-bolt through the holes without scarring the fine threads.
5 The workers used a floor lift, allegedly manufactured by Gray, to elevate the frame. At the time of the incident in question, they were not using "jack stands" in addition to the Gray lift, despite warnings on the lift, which Basford acknowledged, that it should not be used without such jack stands. According to Basford, jack stands could not be used in this process because the frame had to be lowered slowly to allow the holes to line up for insertion of the u-bolt. Jack stands would have prevented the gradual lowering of the frame. Basford also presented eviden-tiary material tending to show that the lift was designed to allow such a gradual lowering and should have sustained the weight of the frame without the assistance of any jack stands.
T6 Basford was under the tractor, wedged between the drive shaft and the elevated frame, attempting to guide the u-bolts when [1283]*1283the lowering process began. Instead of gradually lowering the frame, according to Basford, the lift failed, allowing the entire weight of the frame to come down on him, allegedly causing injury.
ANALYSIS
T7 Gray based its summary judgment motion on three basic arguments.1 The trial court's order does not identify the argument on which its judgment was based, and we will address all three in the order we find appropriate.
Did Basford Misuse the Lift?
T8 According to Gray, the cause of this incident and of any injury to Basford was his blatant disregard of the warnings to use the lift only with jack stands in place. Under this theory, if the jack stands had been in place, they would have held up the frame, even if the lift failed. There is no factual dispute about this. However, the legal effect of these facts is not so clear. Misuse or abnormal use of the product is a defense to an action in Manufacturer's Products Liability, but applies only where the consumer's method for using the product is one which the manufacturer did not intend and could not reasonably be anticipated by the manufacturer. Fields v. Volkswagen of America, Inc., 1976 OK 106, 555 P.2d 48.
T9 The evidentiary material presented to the trial court included information from which reasonable people might conclude that the method of using the lift, chosen by Bas-ford and his co-workers, was an acceptable and foreseeable method for accomplishing their task. To be sure, there was other evidentiary material supporting the conclusion that they could have complied with the warnings. On this record, the question of whether it was reasonably foreseeable that a person with Basford's training as a mechanic would find it necessary to use the lift without jack stands under these cireumstances was one on which reasonable people might differ. Summary judgment was inappropriate on Gray's misuse argument.
Was the Lift Unreasonably Dangerous?
110 Gray argued that the lift could not be unreasonably dangerous because Bas-ford had not demonstrated any defect in the product. This contention is not supported by the record. Basford presented expert testimony which, if believed, demonstrated a design defect in the "wiper ring" allowed the ring to move out of place and obstruct the proper operation of the mechanism on the lift which was supposed to allow the lift to gradually lower the elevated object and prevent it from suddenly releasing the pressure which provided the force to raise the object. Gray pointed out that Basford's expert had not replicated the incident in laboratory tests, but the expert testified such tests were unnecessary to validate his theory. However, the credibility of the expert's opinion, which may or may not be affected by the lack of laboratory replication of the incident, is a decision for the trier of fact. The evidentia-ry material presented by Basford was sufficient to withstand summary judgment analysis on the theory that the product was not defective.
{11 In this same connection, Gray argued that its warning was adequate to inform users like Basford of the dangers of using the lift without jack stands. At least on this record, Basford does not dispute that he was fully aware of the danger of the frame falling if the lift failed and that jack stands would have prevented injury in such a case. However, Gray's warning did not inform users like Basford of the risk that the lift would fail to function normally because of a design defect. Basford's use of the lift without jack stands was arguably foreseeable, and this record supports a reasonable inference that the lift would have been adequate without the jack stands if it had performed as intended. Summary judgment cannot be sup[1284]*1284ported on the theory that Gray absolved itself from all liability by its warning.
112 Finally in this connection, Gray argued that Basford's sophistication prevented the lift from being "unreasonably dangerous" beyond the expectation of the ordinary consumer.
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OPINION
ADAMS, Judge:
1 1 Mike Basford was under the rear axle of a semi-tractor truck, guiding u-bolts into place as part of repairing the suspension on the tractor when the tractor fell on him, allegedly causing injury. Basford sued Gray Manufacturing Co., Inc., alleging that the tractor fell because the floor lift which was used to elevate the tractor frame failed and that the lift was manufactured by Gray. According to Basford, the lift was defective and unreasonably dangerous, making Gray liable for his injuries under Manufacturers' Products Liability and negligence.
12 After some discovery, Gray requested summary judgment, attaching evidentiary materials which it said demonstrated Basford could not recover on Manufacturers' Products Liability or negligence. Basford responded with evidentiary materials of his own and argued that fact issues prevented summary judgment. The trial court agreed with Gray and entered judgment for Gray against Basford. Basford appeals.
STANDARD OF REVIEW
13 In addressing Basford's claim that summary adjudication was inappropriate, we must examine the pleadings, depositions, affidavits and other evidentiary materials submitted by the parties and affirm if there is no genuine issue as to any material fact and Gray was entitled to judgment as a matter of law. Perry v. Green, 1970 OK 70, 468 P.2d 483. All inferences and conclusions to be drawn from the evidentiary materials must be viewed in a light most favorable to Basford. Ross v. City of Shawnee, 1984 OK 43, 683 P.2d 535. We are limited to the issues actually presented below, as reflected by the record which was before the trial court rather than one that could have been assembled. Frey v. Independence Fire and Casualty Company, 1985 OK 25, 698 P.2d 17.
FACTS
I 4 Basford worked as a mechanic for Stin-son Truck and Trailer Repair. On the day in question, he and other mechanics were repairing the rear suspension on a semi-tractor truck. The repairs required the frame to be raised off of the rear axle to allow room for insertion of parts of the suspension, including leaf springs which were held together by u-bolts. The u-bolts are inserted after the leaf springs have been put in place, and the frame must be lowered gradually to allow the holes in the springs to line up and allow insertion of the open ends of the u-bolt. According to Basford, this process requires some person to be under the elevated frame to guide the ends of the u-bolt through the holes without scarring the fine threads.
5 The workers used a floor lift, allegedly manufactured by Gray, to elevate the frame. At the time of the incident in question, they were not using "jack stands" in addition to the Gray lift, despite warnings on the lift, which Basford acknowledged, that it should not be used without such jack stands. According to Basford, jack stands could not be used in this process because the frame had to be lowered slowly to allow the holes to line up for insertion of the u-bolt. Jack stands would have prevented the gradual lowering of the frame. Basford also presented eviden-tiary material tending to show that the lift was designed to allow such a gradual lowering and should have sustained the weight of the frame without the assistance of any jack stands.
T6 Basford was under the tractor, wedged between the drive shaft and the elevated frame, attempting to guide the u-bolts when [1283]*1283the lowering process began. Instead of gradually lowering the frame, according to Basford, the lift failed, allowing the entire weight of the frame to come down on him, allegedly causing injury.
ANALYSIS
T7 Gray based its summary judgment motion on three basic arguments.1 The trial court's order does not identify the argument on which its judgment was based, and we will address all three in the order we find appropriate.
Did Basford Misuse the Lift?
T8 According to Gray, the cause of this incident and of any injury to Basford was his blatant disregard of the warnings to use the lift only with jack stands in place. Under this theory, if the jack stands had been in place, they would have held up the frame, even if the lift failed. There is no factual dispute about this. However, the legal effect of these facts is not so clear. Misuse or abnormal use of the product is a defense to an action in Manufacturer's Products Liability, but applies only where the consumer's method for using the product is one which the manufacturer did not intend and could not reasonably be anticipated by the manufacturer. Fields v. Volkswagen of America, Inc., 1976 OK 106, 555 P.2d 48.
T9 The evidentiary material presented to the trial court included information from which reasonable people might conclude that the method of using the lift, chosen by Bas-ford and his co-workers, was an acceptable and foreseeable method for accomplishing their task. To be sure, there was other evidentiary material supporting the conclusion that they could have complied with the warnings. On this record, the question of whether it was reasonably foreseeable that a person with Basford's training as a mechanic would find it necessary to use the lift without jack stands under these cireumstances was one on which reasonable people might differ. Summary judgment was inappropriate on Gray's misuse argument.
Was the Lift Unreasonably Dangerous?
110 Gray argued that the lift could not be unreasonably dangerous because Bas-ford had not demonstrated any defect in the product. This contention is not supported by the record. Basford presented expert testimony which, if believed, demonstrated a design defect in the "wiper ring" allowed the ring to move out of place and obstruct the proper operation of the mechanism on the lift which was supposed to allow the lift to gradually lower the elevated object and prevent it from suddenly releasing the pressure which provided the force to raise the object. Gray pointed out that Basford's expert had not replicated the incident in laboratory tests, but the expert testified such tests were unnecessary to validate his theory. However, the credibility of the expert's opinion, which may or may not be affected by the lack of laboratory replication of the incident, is a decision for the trier of fact. The evidentia-ry material presented by Basford was sufficient to withstand summary judgment analysis on the theory that the product was not defective.
{11 In this same connection, Gray argued that its warning was adequate to inform users like Basford of the dangers of using the lift without jack stands. At least on this record, Basford does not dispute that he was fully aware of the danger of the frame falling if the lift failed and that jack stands would have prevented injury in such a case. However, Gray's warning did not inform users like Basford of the risk that the lift would fail to function normally because of a design defect. Basford's use of the lift without jack stands was arguably foreseeable, and this record supports a reasonable inference that the lift would have been adequate without the jack stands if it had performed as intended. Summary judgment cannot be sup[1284]*1284ported on the theory that Gray absolved itself from all liability by its warning.
112 Finally in this connection, Gray argued that Basford's sophistication prevented the lift from being "unreasonably dangerous" beyond the expectation of the ordinary consumer. To the contrary, one could reasonably conclude from the evidentiary material that Basford's experience would lead him to believe that the lift would perform as intended and that its use under these circumstances without jack stands, because the job arguably required it, presented no significant risk that the frame would suddenly fall. Nothing in the evidentiary material suggests that Basford should have known that the alleged design flaw in the wiper ring would allow the lift to completely release suddenly instead of slowly lowering the frame. On this record, the question of whether the product was "unreasonably dangerous" must be answered by the jury. _-
Which Lift Was Involved in this Incident?
113 Gray contended summary judgment was appropriate because Basford would not be able to demonstrate which lift, out of three lifts at the shop, was involved in this incident. In order to recover, according to Gray, Basford would have to identify with "significant probability" the product which - caused his injuries. See Case v. Fibreboard Corporation, 1987 OK 79, 743 P.2d 1062. In Case, the Oklahoma Supreme Court answered a certified question from the United States Court of Appeals for the Tenth Cireuit in a case involving alleged injuries from asbestos fibers where the precise tortfeasor whose product injured the plaintiff could not be identified. The Court concluded that it would not adopt some theory of "collective liability" which would impose responsibility upon the entire industry of those using asbestos in their products.
T14 Case is inapplicable on these facts. Although there is some dispute as to which lift was used, Gray manufactured two of the potential candidates, and there is evidence that the only other lift in the shop was not used in this operation. Basford's expert testified that the two Gray lifts were identical in design and that it was of no significance to his conclusions which one was actually used. Moreover, Basford specifically identified the lift he believed was involved, although Gray contends his earlier statements and testimony from others disputes that. To the extent the identification of the specific lift which allegedly failed is necessary in this case, if at all, the evidentiary material presents at least a question of fact concerning that identification. Summary judgment on this basis, was therefore inappropriate.
CONCLUSION
€15 The facts shown by the evidentiary material presented to the trial court, considered in the light most favorable to Basford, and the reasonable inferences from those facts are not consistent only with judgment for Gray. Summary judgment was inappropriate. Accordingly, the judgment of the trial court is reversed, and the case is remanded for further proceedings consistent with this opinion.
REVERSED AND REMANDED.
116 HANSEN, V.C.J., concurs; JOPLIN, J., dissents with separate opinion.