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Old 07-26-2017, 12:15 PM   #31 (permalink)
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Originally Posted by jrnsr View Post
I don't mean to rain on your parade, but...

In the good old days, 90 weight oil went into the rear end and transmission. A Honda was the first car I had that used 10W30 in the manual trans, so they already have built the transmissions around thinner oil. Not sure what the newest cars are using. Heating it thinner may jeopardize the trans

If you want thinner oil, toss in a cup of diesel and then cross your fingers.
10w30 oil is the same viscosity as 85wt gear lube

Thinner, yes but not by much.

My old diffs all took 90w140

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