does my posi still need gm addative
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Joined: Dec 2007
Posts: 39
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From: springfield. aka springtucky.aka.the dirtyfield ohio
Car: 85.iroc.z28
Engine: 385 tpi
Transmission: 700r4
Axle/Gears: 3.42
does my posi still need gm addative
i was changeing the diff oil and am going to use molbil syn oil 75-90. i was wondering do i stll need to use the gm addative? i was guessin that gm did this back in the day for the lack of protection of mineral oil.
Joined: Nov 2005
Posts: 2,346
Likes: 1
From: Naples, FL
Car: 91 RS Camaro, 75 L82 Corvette
Engine: LO3, 383 Stroker
Transmission: 700R4, TH400
Axle/Gears: 4th gen 3.23 posi/LS1 discs, stock
Re: does my posi still need gm addative
I put Mobile 1 75-90 in my rear, and the GM additive. I think I remember reading somewhere that you still need it, even with synthetic.
Joined: Aug 1999
Posts: 19,282
Likes: 103
From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
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