[MODERATOR'S NOTE: The engine oil debate seems to start up every so often and there appear to be as many opinions on engine oil as there are people using it. As this has been covered quite well in the past, postings on this topic will be restricted to substantiated factual data rather than personal opinion. If you have hard data to share on this, please include the source of your data with your posting (like the back of the bottle in this case).] On the Mercedes Benz list the subject of engine oil is well debated. I though this would be of service to the beloved DeLorean PRV engine. Sincerely, Michael Pack Subject: [MB] Just bought some 0W-40 Mobil1 After trading e-mails with my friend at Mobil, I first took his suggestion and contacted my local Benz dealer, as the fellow from Mobil said that MB dealerships had great access to the product, at very favorable terms. So I called the guy I know at the parts counter, said I was interested in the 0W-40 and wanted to know about it's price and availability. "Pete, I'm afraid I can't help you. I've got it, but I've got a 1 thousand gallon tank out back feeding overhead supply lines, and nothing smaller". Since I wasn't in the position to buy 1,000 gallons of it at once, I thanked him, but only after learning they charge $6.50 a quart for an oil change. Then I called a local distributor that they pointed me to. Went there today, opened up a commercial account and bought 10 six-quart packs of the stuff at $28.25/case. Looking at the labeling, I think it answers a lot of questions that many have raised recently on the list. Here goes: FRONT LABEL: European Car Formula Mobil1 Tri-Synthetic Formula 0W-40 Fully Synthetic Motor Oil BACK LABEL: Mobil1 Worlds Leading Synthetic Motor Oil Tri-synthetic Mobil1 Formula 0W-40 exceeds the performance requirements of European automobiles and is engineered to offer outstanding protection in high-tech European engines. It is approved against Mercedes Benz 229.1, a specification which is required by 1998 and newer Mercedes-Benz vehicles. Tri-synthetic Mobil1 formulations are designed by Mobil engineers and use a unique combination of three high performance synthetic fluids proven to outperform all conventional oils. - - European ACEA A3/B3/84-98 Approved - - Mercedes-Benz 229.1 Approved - - Meets engine performance requirements of Audi, BMW, Porsche, Saab, Volkswagen and Volvo - - Outstanding protection for gasoline, diesel and turbocharged car engines - - Tri-Synthetic formula extends engine life by reducing wear and oil breakdown - - Excellent cleanliness and wear protection in high-temperature/hot running engines - - Superior sludge and wear protection under severe, short trip operation - - Helps reduce oil consumption - - Compatible with conventional oils Exceeds API Service SJ, SH/CF warranty requirements for gasoline and diesel engines. And it continues on with some other messages which are not as interesting..... Hope this helps.....