isfvss

I know what the book recommends but is fully synthetic oil the best for a ISF 2011 DIFF just your thoughts would be appreciated cheers

lorenr

iTrader: (1)

Synthetic gear oil from any number of reputable manufacturers is an excellent product. I believe (chemist, retired) it is a better product than standard gear oil. In my opinion it does reduce friction because the number of long chain hydrocarbons is much greater.

Because I own so many vehicles and maintain all of them myself, I always use the lubricants that can go a long time between changes. Synthetics fit that requirement even though they are more expensive. I believe Toyota uses synthetic in their differentials to reduce friction which increases durability.

I believe there are only a few refiners that produce synthetic oils and lubricants. A friend of mine works for a Chevron lube plant and they receive it by rail car. I'm not even sure they add much in the way of friction modifiers.

Loren

mikersoft

iTrader: (1)

FWIW, I used this when I change my diff oil last spring.

-Mike

Greatest

So the book calls for 75w 85m, right? But many are using 75w 90. Is it the consensus that this is fine and or better?
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SoulFreak

iTrader: (1)

https://www.clublexus.com/forums/is-...rear-diff.html

I used exactly what Mike showed above, Redline and same weight.

clarionguy

I used the stock Toyota Diff stuff - came in a steel can.

remember to take the TOP off first - then the bottom drain one - just in case.

In my horrible case I got the top one off and could not get the bottom one off due to corrosion

Greatest

Now that the Balckstone numbers have been called into question, when are you all changing your ATF? Or did that change anything?

jdmSW20

iTrader: (12)

I got my rear diff oil fluid changed at the dealership so whatever the OEM fluid is, that's what's in mine