[T4NZ4NIT3 335i]

I just changed my diff fluids to redline 75w90 and I find out Redline did this. Using the application guide the recommended fluid is this for all f30s now.

https://www.redlineoil.com/product.aspx?pid=40&pcid=4

It seems a whole lot lighter than 75w90..would definitely help in coldweather.but what about spirited driving in summer?

[insanecoder]

Originally Posted by T4NZ4NIT3 335i

I just changed my diff fluids to redline 75w90 and I find out Redline did this. Using the application guide the recommended fluid is this for all f30s now.

https://www.redlineoil.com/product.aspx?pid=40&pcid=4

It seems a whole lot lighter than 75w90..would definitely help in coldweather.but what about spirited driving in summer?

Side question.. do you have LSD or open-diff.. wondering if I can use this oil for my open-diff on a 340i .. changing it break-in
btw went to redline app guide.. still says 75W90 for F30

[123Britt]

~as Thin As Possible, Thick As Necessary~

[D041987]

I am going with the 90 weight as I drive spiritedly. And am sticking with the D4ATF as it is a little thicker then the OEM for the manual trans so better protection and shift feel is pretty close to OEM.

Also all BMW's other than M series have Open Diff's.

[M-terkait]

I had LSD swap to Quaife and we put BMW 75w-85 axle oil,

Quaife approved and said no problem although they recommended 75w-90 in their instructions.