Quote:
Originally Posted by 142 Guy
I suspect Hypoy may be a product name that was used by Castrol. As C1800 notes, GL5 gear oil is the product you want for the differential with the weight as specified in the owner's manual or the service manual.
I think I use Castrol Synthetic 75W90 GL5 in the diff on my 142 E. 80W90 is less common these days and is only easily available in 20 l pails where I live
GL 5 is meant for hypoid gears and has extreme pressure additives which are typically sulfur based. The sulfur based additives are corrosive to brass and will damage the synchronizer rings which is why you must never use a GL5 gear oil in your transmission.
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How about GL-5 with a Moly additive for the diff?