I recently replaced my front and rear differential oil with Redline 75W85 full synthetic.
I've used Redline 75w85 which has the Toyota spec listed on the bottle. Have also used ENEOS 75w90 without any issues.
Under hard driving conditions per the manual reduction gear oil should be changed not just inspected. Almost all off us fall under hard driving. Search around some people have gotten better range out of higher quality gear oil redline I think.
It's hard to find GL4 gear oil anymore. The only real GL4 available in the States seems to be Redline. GL5 oils are generally harsher on brass synchros. I've been using Redline since 2007, when I bought my GTI, and it shifts just as well as it did back then.
I used redline mtlv and can’t recommend enough!!!
Redline gear oil tends to leave a thin film at all times slightly better than motul but does have a slightly longer warm up period.
For me the Redline was crunchier at low temps.
I prefer Redline over Motul, but will use Motul at times because it’s cheaper.
Redline MT-LV 70W/75W GL-4
exceeds the Toyota required standards…used it in both my GX460 and my 4R, has been flawless.
Really wish I hadn't waited until 37k miles to switch to Red Line MT-LV 70W/75W GL-4 Gear Oil. Made so much of a difference and there was a ton of debris on the magnetic drain plug.
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