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75w140 in 335d differential
Recently started hearing a light howl from my rear end between 60-100km/h under partial load. Goes away under full load or while coasting.
I am planning to change the diff fluid to see if that helps me zero in on where the sound is coming from.
I have 2 bottles of redline 75w140 left over from another job, and plan to use this is my open differential. I know spec is 75w90. Will this cause any damage or ill effects running a heavier weight oil? Aside from any slight mileage decrease.
I realize this won't fix a bad differential, mostly trying to isolate the noise for diagnostics. Car is at 86,000km with original diff fluid.
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