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Registered
Join Date: Jun 2007
Location: Southgate Michigan, near Detroit
Posts: 30
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Transmission gear lube question
hello all, as the weather finally clears here in Detroit Michigan, thoughts turn to driving my 1988S4, what i would like to do is change over to all synthetic motor oil and gear lube, and I look to my fellow 928 owners for help, please state your brand name preference and weight - thanks - happy motoring
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04-09-2008, 10:37 AM
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Network Native
Join Date: Jan 2007
Location: SoCal
Posts: 10,349
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Mobile 1 or Redline 75W90 are my choices.
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04-09-2008, 10:39 AM
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Registered
Join Date: Dec 2006
Location: Madison, WI
Posts: 170
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AMS or Redline are my choices as they still contain the necessary zinc/ZPP additives required for proper lubrication. From what I've heard, Mobil 1 has reduce the quantity of these additives to a level that isn't acceptable for older cars.
Just my $.02 worth. |
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04-09-2008, 12:14 PM
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Registered
Join Date: Sep 2007
Location: Fremont, CA
Posts: 160
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I have a 5-speed and an auto. With the 5-speed I've been told that Redline trans/gear oil is best but you have to mix the fluid with an enhancer. That being to much work I just used Mobile 1 with no side effects.
I switched my motor oil from Mobile 1 to Redline and have noticed that the pressure stays higher at idle when hot. I also kept hearing about the reduced additive issue so I switched. I'll probably use Mobile 1 for the auto trans when I flush it. Engine: Redline 20W50 Differential: Mobile 1 75W90 5-speed w/limited slip: Mobile 1 75W90 Auto: Mobile 1
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99 Boxster 5-speed 12 Acura TSX 6-speed |
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04-09-2008, 02:24 PM
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Old 928 Guy
Join Date: Oct 2005
Location: Maryland
Posts: 408
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my 944 wanted GL-4 so i am trying Royal Purple..it's been working well so i bought some more for the 928
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1990 C2 Cabriolet Guards Red  '81 928 Zinnmetallic Project Car (sold)  )'87 944na Maraschino Red Metallic (sold) )
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04-09-2008, 03:43 PM
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