I recently replaced my front and rear differential oil with Redline 75W85 full synthetic.
Vehicle:
Toyota Highlander
Part number: 50104
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I've used Redline 75w85 which has the Toyota spec listed on the bottle. Have also used ENEOS 75w90 without any issues.
Pros: no 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.
Pros: better range
Vehicle:
Nissan Leaf
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.
Pros: shifts just as well
Cons: hard to find
Vehicle:
Volkswagen
I used redline mtlv and can’t recommend enough!!!
Pros: highly recommended
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.
Pros: better than motul
Cons: longer warm up period
For me the Redline was crunchier at low temps.
Cons: crunchier at low temps
I prefer Redline over Motul, but will use Motul at times because it’s cheaper.
Pros: prefers Redline
Cons: Motul is 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.
Pros: exceeds Toyota standards, flawless
Vehicle:
Toyota 4runner
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.
Pros: noticeable difference
Cons: waited too long
Mileage: 60000 km
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What we know about RED LINE gear oil
The brand is registered in USA.
In March 2026, PartReview users have a positive opinion of RED LINE gear oil.
PR Score — 80 out of 100, based on 36 reviews and 113 votes. 27 positive reviews, 5 neutral reviews, 4 negative reviews. Average rating — 4.1 (out of 5). Vote balance: 91 up, 22 down.
In the ranking of the best gear oil this part is at position 1 ahead of AMSOIL and MOTUL.
Users also evaluated the qualities of RED LINE gear oil:
- Noise - howl or rumble from the diff area is easy to hear - rated positively. 4.3 points out of 5.
- Smell - strong sulfur-like odor after a drive can indicate leaks - rated negatively. 1.5 point out of 5.
- Leaks - wet gear oil at the housing or on the driveway is obvious - rated positively. 3.6 points out of 5.
Gear oil RED LINE in car-specific ratings
See which car brands and models owners choose RED LINE gear oil for. Below are car-specific ratings where this part is in the Top-3:
- RED LINE ranked #3 for: Volkswagen Golf .
Gear oil RED LINE in comparisons
There are 2 comparisons of RED LINE gear oil with other manufacturers on PartReview.
In particular, see which gear oil are better: MOTUL or RED LINE, AMSOIL or RED LINE .