Gear box oil help

[24carrot]

Hi I am changing my gear box oil .and when I went to buy the new oil .for my 1992 4.2 td .they sed the gear box oil had been updated . and the oil I now need is 75w_ 90 fs .and that is a fully synthetic gear oil. Is this right


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[Chris]

I think in reality the type of oil is purely a choice / recommendation. It's the GRADE that matters. It is and always has been 75w 90

 

[AndycruiserguyLomas]

Any type of non hypoid 75-90 gear oil will do the job. Our trucks run straight 75-90 mineral gear oil and cover 100's of K's without a problem so synthetic is not a necessity. That said I did change mine (97 GX) and put this in:-


TBF it didn't really change anything from what came out noise or change quality but at least I know whats in there.

 

[24carrot]

Can you mix fully synthetic and a straight 75 90?

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[frank rabbets]

Don't put GL 5 or EP oil in the box. It will damage the synchro rings in the long term.

 

[frank rabbets]

P.S. you can't obtain the original oil any ore. The new Toyota part number refers to 75-90 semi synthetic. Use Comma.

 

[AndycruiserguyLomas]

Can you mix fully synthetic and a straight 75 90?

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Yes, you won't know any difference.

 

[chapel gate]

I use redline mt 90. Helped with a whine and improved cold weather shifting.

 

[Dave2000]

I had a nightmare finding an oil with a low GL rating, even GL 4 is a tad on the high side if much of what I have read has any merit?

regards

Dave