Reply to "CASTROL Hypoy C 80W-90 - Are there different kinds?"

dave2811Member

When I talked to Lloyd Butfoy he recommended any 80W-90 gear oil would satisfy the requirements.

Interestingly, the service bulletins mention that API GL-4 is specifically recommended, although you have to find this on the bottom shelf at the hardware or grocery store automotive aisle. Most automotive outlets carry only API GL-5.

The ZF does not require hypoid rated oils because it has spiral bevel gears, not hypoid, which have a higher sliding friction component of their geometry than spiral.

7/12/117:12 PM

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