Quote:
Originally Posted by JSeery
It's not harmful in the sense it will cause direct damage, it just doesn't provide the required protection to mating surfaces. Worm gears wipe grease from the mating surfaces and there will be greater wear (the worm gear surfaces wear more quickly). Additionally the steering gears will move easier improving steering.
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You are correct in the 85W vs SAE 90. I meant SAE 90 but am prone to typos in my old age. Another problem with grease is it will may not work it's way up to the upper bearing in the box, leaving it unlubed.