1) All Mobil-1 oils can suspend 2% soot, which is when Mercedes recommends changing the oil anyway.
2) Every engine's soot production is different. My 617 engine would reach that 2% limit by 5-7kmi, while my 603's are maybe 1% at 10kmi. You need to test YOUR engine to find out when to change the oil. Changing synthetic every 10-15k vs dino every 5k is actually cheaper when you factor in the cost of filters & your time, and if you buy the 5qt jugs at Mall-Wart (of 5W-40) for <$20. 3) Both the 5W-40 and 15W-50 weights of Mobil-1 are suitable for nearly every temperature extreme in the USA. No need for thicker oil in Death Valley summers or thinner oil in Minnesota winters. I strongly prefer the 5W-40 (Delvac-1) over all the other varieties, I use this in ALL my cars, gas and diesel. 4) Hey, it's not for everyone, but it's not some big waste of money either. If people are happy changing dino frequently, great. I've got piles of oil analysis that prove to me it's cheaper for MY cars to do extended drains with synthetic, no external bypass filters required. (Bypass filters are a whole separate topic... but I couldn't see any advantage for MY use.) YMMV, etc etc, flame suit on, yadda yadda... :-) Dave M. Boise, ID > ------------------------------ > Date: Tue, 23 Aug 2005 11:33:44 -0400 > From: Steve MacSween <[EMAIL PROTECTED]> > Subject: [MBZ] Oh oh, another oil thread > > > > It's the People's Cult Oil. > > Well, people who argue that buying Dollar Store Old Yeller at 99c a quart is > just as good in the long run are in their own cult too, RIGHT ;-)? > > > Mobil 1 was originally marketed as having the ability to outlast other > > oils, but people are still changing it out every 3 - 5 k miles anyway. > > That makes it REALLY Very Expensive! > > Well, first, lots of people who use Dino change every 1-2k miles on gassers, > which is also more expensive and could be argued to be wasteful. > > Second, I think this discussion was about diesels, and it's not a secret > that M-1 cannot suspend the soot and diesel combustion byproducts unless a > secondary filtration setup is present, so 3-5k miles is about as far as you > can push it. Plus some of us live in colder climes that switch to extreme > heat in the summers, so we often have to drain our oil well before its > service life anyway, to use a more suitable weight for the season, just a > fact of life. > > mac >
