Quote:
Originally Posted by whunter
I have followed the MB technical bulletin, installing synthetic 75w90 in thousands of vehicles with no issue.
My personal vehicles have synthetic 75w90, with no issues.
As a side note, I have installed conventional 80w90 hypoid gear oil for many customers with only minor increase of gear noise.
The only reason MB suggested synthetic 75w90 was lower gear noise.
This is a personal decision.
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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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