When a motor oil like T6 or M1 Turbo Diesel has both diesel and gasoline motor ratings, how is that possible? I've been using T6 in my '94 530i, and I've been using it because it carries an SM rating in addition to the relevant diesel specs. I just don't understand how it can carry both.
Dual Rated Oils
- Thread starter kschachn
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JHZR2
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It's all in the add pack and what the spec requirements demand. If, say, higher tbn and detergent/dispersant doesn't effect the ability to meet a gasser spec, then they can coexist. Much of the chemistry is the same, though it does seem like the non-dual gas oils have more tricks they can play.
Because the difficult SM specs only apply to "resource conserving" grades (5-30, 5-20, 0-20) so the 10-30 and 40 weight oils have a lot more leeway for viscosity and zddp content.
As bepperb said, it's because pretty much everything under Xw40 is intended to be resource-conserving (excluding some 5w30s and 0w30s). Those are not going to be for diesels.
Well, you will find some 0w30 and 5w30 dual rated oils up here, as you alluded to. Of course, none of them will be GF-4 or GF-5 rated, so don't have quite the same limitations that an SM/GF-4 or SN/GF-5 PCMO would have.
At least for a time, a lot of PCMOs were dual rated, at least with obsolete Cx specifications. I noticed a lot of the PCMOs are no longer dual rated, forgoing the old diesel specifications.
Check at http://imperialoil.ca/Canada-English/Files/Products_Lubes/IOCAENCVLESEsso_Xd-3_extra.pdf for a few interesting HDEO grades. The lines are being consolidated with the Delvac ones, so not all are/will be available.
I'm going to try to get some of the 5w30 SH/CG-4 for my old F-150. It'll have plenty of zinc and not be outrageously thick. Last time I checked, though, they wanted too much money for what is essentially an outdated and discontinued oil.
To the original poster, I tended to use 15w40 in my 1991 Audi 200 Turbo. It was the most widely recommended grade in the manual, and it's pretty hard, if not impossible, to find a 15w40 that doesn't have a C rating in addition to the S.
At least for a time, a lot of PCMOs were dual rated, at least with obsolete Cx specifications. I noticed a lot of the PCMOs are no longer dual rated, forgoing the old diesel specifications.
Check at http://imperialoil.ca/Canada-English/Files/Products_Lubes/IOCAENCVLESEsso_Xd-3_extra.pdf for a few interesting HDEO grades. The lines are being consolidated with the Delvac ones, so not all are/will be available.
I'm going to try to get some of the 5w30 SH/CG-4 for my old F-150. It'll have plenty of zinc and not be outrageously thick. Last time I checked, though, they wanted too much money for what is essentially an outdated and discontinued oil.
To the original poster, I tended to use 15w40 in my 1991 Audi 200 Turbo. It was the most widely recommended grade in the manual, and it's pretty hard, if not impossible, to find a 15w40 that doesn't have a C rating in addition to the S.
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