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Old 03-06-2006, 08:38 AM   #5
JackG
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Join Date: Mar 2005
Location: South Carolina
Posts: 530
Redline MT-90 is a GL-4 rated 75W90 synthetic gear lube.

Royal Purple also has a Max-Gear synthetic that is GL-4/5 rated.

Both are claimed to not be corrosive to soft metals. Maybe these are possibilities?
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2000 Boxster S - gone -
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