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Re: What brand oil do you use?

To: sfisher@wsl.dec.com
Subject: Re: What brand oil do you use?
From: Dick Nyquist <dickn@hpspdln.spd.hp.com>
Date: Mon, 12 Nov 90 11:10:12 PST
| >& do you mean I should have put non-detergent oil in my TR4 gearbox because
| >of problems with the syncro rings???
| 
| Rumor has it.  Apparently some synchronizer rings are coated with
| a compound that the detergent removes, which accelerates wear.  I
| seem to recall that Alfas are the main victims of this user error
| and I don't know whether or not British cars succumb to it.  I 
| used detergent Castrol 20W50 oil in my Midget's gearbox, which
| eventually lost first gear (no synchros on that one), but that
| was at 11 or 12 years of age.
| 
 I have heard that once converted to 90wt it's best to stick with it.
Going back to 30-50 after many miles on 90wt may not be a good idea 
unless you are rebuilding th box.

While I would not knowingly use detergent oil in a gearbox, I am 
skeptical of the coated syncro theory. Do you have any additional
information?

regards/dick nyquist| 



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