domino

Well-Known Member
So, I bought some Westway 80w90 Gear Oil - mmarked as API: GL4.

Doing a bit of searching, some people seem to suggest the P38 need GL5. Others make no mention of it. RAVE makes no mention of it and simply states "Texaco Multigear 75w 90R" - no mention of API.

What is the *correct* fluid for the front and rear diff before I open this container?
 
So, I bought some Westway 80w90 Gear Oil - mmarked as API: GL4.

Doing a bit of searching, some people seem to suggest the P38 need GL5. Others make no mention of it. RAVE makes no mention of it and simply states "Texaco Multigear 75w 90R" - no mention of API.

What is the *correct* fluid for the front and rear diff before I open this container?
makes no difference theres no yellow metal in the diffs
 
It's more the api rating I was curious about.

Have ordered some gl5 just in case anyway
The synthetic I use has the highest spec anyway. GL5. I think the GL4 info may be out of date and was the highest spec at the time of Rave or handbook publication? Likewise with the API rating for the engine oil.
 
GL4 is more for axles/gearboxes with brass/bronze components, whereas GL5 will do more harm. But as the P38 diffs don't have any such material in, GL5 is fine. I run 75w90 GL4 in min as its what I use in all my other cars.
 

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