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Just my $0.02 worth. My mechanic (& I too) swear by 20W50, but ONLY Castrol brand. My mechanic's explains that Castrol designed its oils with the aircooled motorcycles in mind. Hence, it is specific to the extreme temps associated with the T3s. Also, I live in CA. Our temperature ranges between 70 and 105 from May through October. The 15W40 sounds very interesting. Are you using Castrol? Does Castrol make it? Kevin Toney bodhran-man@bigfoot.com ________________________________________________________________ ________________________________________________________________ "Anyone who cannot cope with mathematics is not fully human. At best he is a tolerable subhuman who has learned to wear shoes, bathe, and not make messes in the house." L.L. ---------- From: Bill[SMTP:bclark@primenet.com] Sent: Thursday, May 22, 1997 9:03 PM To: type-3@umich.edu Subject: Re: Oil Grade ? 15W40 was recommended by the dealer when my '90 Dodge Caravan V6 was new. I've used it ever since. But for some reason, it's not available on the shelves even though I've heard it recommended for turbos and other applications. I a buy popular brand by the case from a local distributor. Usually 2-3 cases at $11 to $15 per case. I'm in Phoenix where the heat is brutal in the summer and I do a lot of highway driving. I use 15W40 all year with oil changes every 3000 miles, and after 150000 miles, I lose maybe a half quart between oil changes. I'm not complaining. Now, I have a '72 SB (Primary Owner) total project that I'm getting ready to install a rebuilt engine/tranny. I was told that, since I am looking for engine reliability and longevity, 15W40 would be good, but 20W50 would be better and 2000 miles for oil changes would be imperative. Up to about 10 years ago, I was switching between 30W and 40W depending on seasons. Now, even for the air cooleds, mechanics don't hesitate to recommend the multi-grade oils because of their vastly improved durability and resistance to heat degradation. Anyway, notice I'm not pushing brands :). I'm just relating my experience, FWIW. YMMV :) (Been lurkin' here for some time while doing my project. There have been excellent ideas and suggestions here. I'll do more participating ...I think I 'bout have this headliner thing figured out :) Bill Clark bclark@primenet.com '72 T3 Squareback (Making a comeback) '59 Porsche 356A 1600 Coupe (Long since lost victim of the Rust Grinch (sigh!))