¶1OPINION OF THE COURT
¶2The principal question raised on this appeal is whether an agreement between two parties which provided that only one of them would operate a scrap metal shredder in the Rochester area is in violation of either the Sherman (US Code, tit 15, § 1 et seq.) or Donnelly (General Business Law, § 340) Acts.
¶3The basis of this action is a written contract made between the plaintiffs, owners of a scrap metal business in Rochester, and defendant which is also in the same business. Both parties purchased and processed scrap metal and resold the processed scrap to steel mills and foundries and were at that time considering the purchase of a metal shredder to process light metal. Steel mills preferred the shredded metal because the shredding process separated ferrous and nonferrous scrap and allowed them to purchase a cleaner grade of scrap. When defendant learned that plaintiffs had placed a down payment on a shredder, it initiated negotiations to ensure that there would be only one shredding operation in the Rochester area. Both sides agreed that there was not enough raw material in the area to support two shredding operations. They eventually reached an agreement whereby plaintiffs assigned the shredder purchase contract to defendant in return for 2% of defendant’s gross sales for the next seven years. After one and one-half years had elapsed, defendant ceased making payments under the contract.
¶4Plaintiffs originally brought suit in October, 1978 for judgment allowing them to inspect defendant’s books and for the amount they claimed was due under the contract. Defendant raised the affirmative defense that part of plaintiffs’ consideration for the contract consisted of an oral restrictive covenant not to operate a shredder in the Rochester area which rendered the contract unenforceable. Plaintiffs’ motion for partial summary judgment was granted by Special Term, which ruled that defendant would not be allowed to prove any oral agreement because *334of the contract’s integration clause. Defendant appealed and this court reversed, holding that “[p]arol evidence is admissible to show that the consideration for a contract is illegal” (Atkin v Union Processing Corp., 77 AD2d 790, 791). Plaintiffs then moved for a separate trial on the issue of the legality of the contract. After a trial was conducted, the court found that the alleged oral agreement not to compete was part of plaintiffs’ consideration for the contract and that, since the agreement was in restraint of competition, it was per se unreasonable and in violation of both the Sherman and Donnelly Acts.
¶5Plaintiffs present two contentions on this appeal. First, that the contract between the parties represents their entire agreement and contains no illegal restraint. Second, that, even if an oral agreement not to compete existed, it was reasonable within the meaning of both the Sherman and Donnelly Acts and, therefore, the contract was enforceable.
¶6Plaintiffs’ first contention is without merit. Parol evidence was properly admitted at trial to establish the existence of plaintiffs’ oral guarantee not to install a shredder in Rochester (Atkin v Union Processing Corp., supra).Both parties testified at trial that there were only enough raw materials available in Rochester to operate one shredder profitably. The parties also agreed that the purpose of the negotiations was to ensure that only one shredder would operate in the Rochester area. The only question on which the parties disagreed was whether plaintiffs had orally covenanted not to operate a shredder in competition with defendant. It was up to the trial court to determine the credibility of the witnesses who testified. The trial court is in the best position to evaluate the credibility of witnesses and its findings should be given great deference (Perry v Perry, 79 AD2d 851; McCall v Town of Middlebury, 52 AD2d 736). The record in this case supports the trial court’s finding that an oral agreement not to compete was part of plaintiffs’ consideration for the agreement.
¶7Plaintiffs next contend that, even if an oral agreement not to compete existed, it was reasonable within the meaning of the Sherman and Donnelly Acts. Assuming *335that the Sherman Act was properly asserted in this case,
¶8Judgment in favor of defendant should be reversed and the contract declared valid and not in violation of either the Sherman or Donnelly Acts.
¶9*337Simons, J. P., Hancock, Jr., Callahan and Doerr, JJ., concur.
¶10Judgment unanimously reversed, on the law, with costs, and judgment granted, in accordance with opinion by Moule, J.
¶11. The general question of whether a Federal antitrust statute may be raised as a defense to a contract action in State court is unclear (see General Aniline & Film Corp. v Bayer Co., 305 NY 479; Remington Rand v International Business Mach. Corp., 167 Misc 108; but see American Broadcasting-Paramount Theatres v American Mfrs. Mut. Ins. Co., 42 Misc 2d 939, affd 20 AD2d 890, affd 17 NY2d 849, cert den 385 US 931). Given the context of this case, we need not pass upon this issue.
¶12. Defendant admitted at trial that the agreement between the parties would not have prohibited plaintiffs from setting up a shredder in close proximity to Rochester.