1999-2009 [Subscribe to Daily Digest] |
Hey KenD,
I'll step out on a limb & answer your questions (& maybe some others you didn't ask).
Yes, this oil has distinct advantages over Mobil's 0W-40. Primarily, it offers better high temperature/high shear stability, which is precisely what your 100,000+rpm turbo needs. It also offers a more robust additive package, which (also) benefits your turbo. Don't forget, you have NO CONTROL over when your turbo is working! There's no on/off switch you can throw; it's always "on," & it's simply a degree of "how much?" Also, keep in mind that all of Saab's OE oils both in Europe & North America are diesel-style oils, for use in all of Saab's gasoline & diesel engines. Add to that the improved film strength & the fact that (as others have already pointed out) it's one of Mobil's best-built oils, & I think you have a winner all-around. The only better oil for Saab's turbo engines would be Mobil's 15W-50. (But you'll never see it spec'd, 'cuz the 0.2% worse fuel economy (WAG) has too great of an impact on Corporate Average Fuel Economy ("CAFE") numbers & costs GM a lot in Eco-buck$.) If your climate rarely gets below freezing, you're better off using this oil all year long.
This new 5W-40 will do absolutely no harm to any catalytic converter, as it's also API SL rated. Mobil doesn't care to get it GF-# rated 'cuz they aren't marketing it towards cars. (The only reason the 0W-40 is GF rated is because ACEA A3 doesn't have any fuel economy improvements as part of their criteria. The ILSAC spec is simply the easiest way to show the general public that this oils offers fuel economy benefits along with everything else it does.)
By all appearances, it's exactly the same as Delvac 1. Why would Mobil offer it for less than their premier diesel oil? Economics. They sell millions of gallons of Delvac 1 to the trucking industry (it's also sold as Cat-branded syn diesel oil), so several hundred thousand quarts per year at the general-consumer level is peanuts in the scale of their business.
Now, I must admit that my oil change intervals for my 9³ are 10,000 miles (currently on 0W-40, but only for the next 1500 miles), so these better oils offer improved protection for this kind of use. I'd still recommend 0W-40 for long stints in sub-0°F climates, or for any non-turbo engine. But if you live anywhere else & drive a Saab turbo, then this new M1 is a better alternative.
posted by 64.207.44...
No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.
 |
 |
 |
 |
 |
