Im changing fluids on my 670 challenger and the manual shows the rear rotor gearbox needing 85w-90. Talked to my local oil supplier and he hasnt heard of this type. Recommended just using 75-90. Is this fine or should I order some 85-90? Thanks.
75-90 will be just fine, any type of oil rated for gear lube will be fine. I actually run hydraulic oil where I use to run 75-90 for better lube in cold weather and I have great results in fuel efficiency with it
Supplier never heard of 85w-90?! It's very common. Even my local Napa has it on hand in 5 gal buckets. I believe the difference between the 75 and 85 is that the 75 is either synthetic or semi-synthetic.
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