fastnoypi

Planning to replace and refill my rear differential and transfer case fluids. The manual calls for 80w90 GL-5 spec. For most applications 75w90 can be substituted for colder weather areas and comes in synthetic whereas 80w90 is commonly natural mineral based.

Not all spec'd oils are equal and may/may not have friction modifiers that Toyota/Lexus will like.

What's out there that is proven for Lexus/Toyota and easily available (non-boutique) and not dealership bottled?

carguy07

Mobil 1 75w-90 works perfect, is cheap and easy to find. Unless you have the old LSD, I would just put Mobil 1 in it and forget about it. I have run it for years in both with no issues at all.

hypervish

I'm using Royal Purple 75w-90, that was based on suggestions here. However upon further research, particularly on BITOG, it appears RP isn't that great. Mobil 1 is better in most regards and a better option. And, if you want the absolute best, Amsoil is the way to go; but that isn't as easily available.

salimshah

I have a FWD RX. But other car with a diff get Redline.

Salim

fastnoypi

Thanks for all the input so far. Redline 75w90ns is great stuff but I got sticker shock since I last ordered it at almost 18/qt.
Mobil 1 75w90 seems to be popular at BITOG.

One other oil that is of notable mention in my research is Walmart Supertech 75w90 made by Warren Petroleum. It meets the very strenuous specifications of Mack Go-J extended change intervals like the Mobil 75w90.

Reading up more on other possibilities but the Supertech price point is very attractive for its spec sheet.

salimshah

Its not too bad if you do the $$/mile cost. I needed 3qts for 2 vehicles. For 1 you will have to think about the left over for many years.

I have seen the old oil being drained by others and redlines looked almost new. I have not drained mine and would not be needing to do it for quite a bit.


Salim

rickl289

I used Mobile 1 since I use this in my other cars. While I don't plan to drain/fill as often as Lexmex, I'm planning to do another round this summer.