I guess you are aware of long-life oils in general. They come in 2 basic forms, diesel-rated 15w-40 (HDEO) and their synthetic cousins' 5w-40 Euro ACEA A3 oil, a few overlap into diesel service. The other long-life oils are more high-tech and contain extra esters and PAO basestock, they go MAD miles and carry European manufacture specs to go 15,000-30,000 miles. Some examples of the first type are: Delvac 1300 15w-40, Chevron Dello 400 15w-40 and 10w-30. Synthetic 5w-40s are Shell Rotella, Valvoline Synpower, Delvac-1, Belgium Castrol Syntec, Kendall. A newer ester-rich formula with mfg specs would be; Mobil 1 0w-40, German GC Syntec 0w-30, Saab Synth, and any 0w oil. All that being said, you live in warm Cali and could use the cheap HDEO 15w-40 up to 10,000 miles, easy. If cost is no object, I would skip the Euro-spec and diesel 5w-40s except Mobil 1 5w-40 SUV and go for German Castrol 0w-30. 10,000 miles is do-able.
[ February 01, 2004, 12:41 AM: Message edited by: TSoA ]