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when you look at the product details, they will have specifications that they adhere to.
Penrite Pro Gear 75-90 Full Syn for example has:-
Key Specifications:
•API GL-5/GL-6/MT-1
•MIL-L-PRF-2105E
•Ford M2C-200C, BTR 5M-50 & more
The MIL being the spec you wanna see on the specs. I think it is 'D' and 'E' on the end you'd wanna see.
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