Mobil 1 Turbo Diesel Truck Full Synthetic Motor Oil 5W-40, 1 Gallon

This oil isn't for just diesel engines. It is also approved for cars. I use this oil for my Lotus Elise because it is one of the few oils that still has high ZDDP (a zinc additive), and Lotus recommends a 5W40 weight. High ZDDP extends the life of engines that have high pressure sliding surfaces, which is more common in high compression engines (like diesel engine piston rings - hence the name of the oil). On my car, the primary concern is sliding valve rocker arms for my high RPM cams (it has rollers for the low RPM cams like most modern engines). The downside of zinc additives, and the reason it has been reduced in regular car oil, is that it shortens the life of the catalytic converter. But, I would rather replace my catalytic converter than my engine. The Toyota and Pontiac cars with the 2ZZ-GE engine have this same issue (2000-2005 Celica GTS, upgraded Matrix, Pontiac Vibe, possibly others). What I don't like about the value is that it is more expensive than other Mobil 1 Synthetic oils, and only comes in 4 quart jugs instead of the standard 5 quart jugs (my car needs 5 quarts for an oil change). My solution was to buy 5 jugs at one time using the site-to-store option, which was very convenient as it turned out it was not stocked on the shelf. It was only in the warehouse in the back of the store.

I got this for half the price on what I paid at an auto parts store. The strange thing is, I never saw it on the shelves, even after looking many times, but found it online and picked it up at the store I normally shop at!