TwinTurbo.NET: Nissan 300ZX forum - My 98+ has about 1500 miles and I am waiting longer.
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Subject My 98+ has about 1500 miles and I am waiting longer.
     
Posted by Gordo 93TT Daytona on September 20, 2009 at 8:18 PM
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In Reply To How long to leave in factory fill in manual tranny? posted by aquariuscsm on September 20, 2009 at 10:26 AM
     
Message At 1500 miles, the gear shifts are just beginning to become smoother. I think the higher friction of the factory fill gear oil promotes the break in process as contact surfaces wear together and mate with each other. IMO changing over to a super slick synthetic blend too soon will inhibit this process. My theory is the proper time to change is after the gear surfaces have developed a good wear pattern; but before the synchros have had a chance to begin to wear and grind.

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