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Latest results at 5,000 miles on initial fill of Mobil 1 ESP 5W-30 in 2007 Jeep Grand Cherokee CRD with Mercedes-Benz OM642 3.0L V6 turbodiesel. Iron is approaching normal limit of 40ppm, copper is steady. Calcium and phosphorus went up? Both viscosity and soot are stable. TBN went up, too...

I received a case of 12 liters of Mobil 1 5W-30 ESP Formula motor oil yesterday from AV Lubricants. I got this for my 2007 Jeep Grand Cherokee (WK) CRD with the Mercedes-Benz 3.0L OM642 engine. This is one of the bare handful of oils available that meet the MB 229.51 specification. Check out...

Here's the analysis after 4006 miles on new 2007 Jeep Grand Cherokee (WK) CRD with M-B 3.0L engine with factory fill of Mobil 1 5W-30 ESP (MB 229.51): Iron is steadily climbing. If it goes above 40 ppm, it'll be in the abnormal range. Aluminum is approaching the maximum normal range of 10...

Just got my 2K and 3K sample report. TBN is dropping, but will probably stabilize. Calcium going up? Soot went up at 1K then dropped a little at 2K (during long hot road trip). Phosphorus going down. Less than 200 miles to go until the 4K mark!

Is it simply an R & O oil or an hydraulic oil? It really can't be all that mysterious, given that most specs call for "PS" fluid or ATF. What would be a suitable off-the-shelf synthetic alternative, apart from the obvious ATF applications? Viscosity? What else? Why, of all things, is PS fluid...

Biodiesel, that is, anti-Texas Tea, which is. Either I have to apply for a cardlock operation, or I'm referred to a "24/7 public" pump, where I still need a fleet card to get it. And why not B5, the more-or-less universally acceptable grade, if not B20, as opposed to B99? I was all set to...

Well, today I'll be mailing off an initial or voluntary oil analysis at 1001 miles on my new 2007 Jeep Grand Cherokee with the Mercedes-Benz OM 642 DE30 LA 3.0L V6. This is just to establish a baseline reading. I don't know what Jeep uses as the factory fill, but the dealers stock MB 229.51-spec...