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I emailed ZFDOC about useing Redline MTL All-Synthetic transmission lubricant that is API GL-4 SAE rated 70w80 and engine oil rated SAE 30,10w30and 5w30 he replied that the Redline product is just as good as the BMW 10w60 engine oil. And after changing last week my ZF shifts smoother when COLD (I had the old Redline in for 25,000 miles)I WILL change at 15,000 miles from now on after the estimate he gave me to BLUEPRINT my ZF (about $2000.00 parts and labor) and my ZF has 60,000 miles on it and it works GREAT. I tried the shifting from ist to reverse when the engine is cold and there is No problem(clutch is working fine):thumbsup:
 
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