Quote:
Originally Posted by DeliveryValve
I have no problems with using synthetic 75w90, in fact I run it in my vehicles. Both Mobil 1 and Lubro Molly with not a peep of gear or bearing noises.
What I've experienced and what I know is that differentials do get dirty with conventional fluid, especially units that have not been changed out for 100,000 miles. Now are you telling me you are not going see crap inside a diff with 100,000 mile conventional fluid? And are you going to tell me the detergents of a synthetic fluid will not loosen it all up? We agree to disagree.
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I disagree with the negative assumption.
From my experience, most owners are wise enough to open and clean the differential when the old fluid comes out with sediment.
Often this is discovered and cleaned while changing the older clip style axles.
On vehicles new to me, I usually replace the differential mount and open the differential for cleaning at the earliest moment.
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