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rotorwrench · 05-03-2011, 08:54 AM

Lubriplate SPO series gear oils are GL-1 mineral types. If you have a Purvis Bearing shop near, they are a distributor. Restoration Supply company is also a distributor. SAE grades up to 250 are available but 140 (SPO-277) should do the job. The GL-4/GL-5 oils that are most prevolent these days have extra pressure additives that can corrode the bushings in the older transmissions. You can use them but they will slowly degrade the yellow metal parts. They will work fine in a rear axle though since there are no bushings in there.

Kerby

PS: Nearly all the EP additives used today contain materials that actually eat there way into a metal surface to provide scuff resistance albeit microscopically. Most have sulphur or phosphorous and both are mildly acidic in the EP formulas

05-03-2011, 08:54 AM	#9
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,426	Re: Transmission oil Lubriplate SPO series gear oils are GL-1 mineral types. If you have a Purvis Bearing shop near, they are a distributor. Restoration Supply company is also a distributor. SAE grades up to 250 are available but 140 (SPO-277) should do the job. The GL-4/GL-5 oils that are most prevolent these days have extra pressure additives that can corrode the bushings in the older transmissions. You can use them but they will slowly degrade the yellow metal parts. They will work fine in a rear axle though since there are no bushings in there. Kerby PS: Nearly all the EP additives used today contain materials that actually eat there way into a metal surface to provide scuff resistance albeit microscopically. Most have sulphur or phosphorous and both are mildly acidic in the EP formulas Last edited by rotorwrench; 05-03-2011 at 09:03 AM.