i just picked up 12 quarts of chevron delo 15w40 for $1 each. this stuff is usually about $6.50 per us gallon, or ~$2 per quart. i asked twice for the gentleman to verify the price, both times both gentleman told me $1. was expecting to pay about 13$ for ONE oil change on the e34, now i have enough oil to do two for the same price i hate walmart anyway, its good if i inadvertently screwed them over. chevron delo, for those who don't know what it is, is an excellent heavy duty diesel oil, of grade 15w40. people in the know use it in gasoline engines to remove deposits synthetic oils like mobil 1 can't even touch. an added benefit is that in normal cars that can use 40 wt oils, the stuff lasts at least 4500+ miles between changes, as shown in analysis at bobishteoilguy. i'm cheerful, first this, then i find gas has gone down 5cents to 2.40 for 93 octane.