The Ford Barn

42merc/ma · 11-22-2010, 11:42 AM

Hi, Happy Thanksgiving to all. Question, is there a safe multi-viscosity lube for 42 merc rear end and transmission or should I continue to use the red sticky stuff? Thanks for any responses.

rotorwrench · 11-22-2010, 02:30 PM

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If you have access to SAE 140 that would be close to original unless it is a GL-5 type. 85W/140 will work well in cold weather but may show signs of leakage in hot weather but they are GL-5 as well. The GL-1 type lubes are getting harder to find at the local level but can be ordered from most all of the restoration parts suppliers(Restoration Supply Co. for 1). GL-1 has low sulphur additives that won't deteriorate silver and copper alloy bushings like the second gear mainshaft bushing, reverse idler bushing, etc.

Some oil is better than no oil even if it has a sulphur content.

Kerby

11-22-2010, 11:42 AM	#1
42merc/ma Junior Member Join Date: May 2010 Location: middleboro, ma Posts: 20	lube Hi, Happy Thanksgiving to all. Question, is there a safe multi-viscosity lube for 42 merc rear end and transmission or should I continue to use the red sticky stuff? Thanks for any responses.

11-22-2010, 02:30 PM	#2
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,577	Re: lube Sponsored Links (Register now to hide all advertisements) If you have access to SAE 140 that would be close to original unless it is a GL-5 type. 85W/140 will work well in cold weather but may show signs of leakage in hot weather but they are GL-5 as well. The GL-1 type lubes are getting harder to find at the local level but can be ordered from most all of the restoration parts suppliers(Restoration Supply Co. for 1). GL-1 has low sulphur additives that won't deteriorate silver and copper alloy bushings like the second gear mainshaft bushing, reverse idler bushing, etc. Some oil is better than no oil even if it has a sulphur content. Kerby