He's the target customer for Mobil Clean 7500, I think. The Iffy-Lube sticker was about 5000 miles and 6 months overdue. It's a 1997 Del Sol. I used a Purolator Pure One filter, figuring it should last 7500 miles. I also replaced the crush washer with a metal/rubber gasket (see the other post). The filter that was on there is a Mileguard which is made by Fram. I can't wait to cut that apart and see how wasted an ~8000 mile Fram filter is. I figure that if he's gonna go that long between oil changes, it should be with an oil that offers some guarantee that it can. At $2.20/quart, Mobil Clean 7500 is a deal, I think. I also changed the oil in his girlfriend's Saturn. It has the 2.2L Ecotec--changing the filter on that is a breeze and you can drain the oil without even needing to jack it up. I used Mobil Clean 7500 in this car, too. The "change oil" light had been on for a while. I didn't look at the Iffy-Lube sticker on that one, so I don't know how overdue it was. (My friend did tell me that Iffy-Lube charges extra for the cartridge filter, I believe $10 extra). I was pleasantly surprised at how easy changing the oil on the Saturn is, because my mom's car (2004 Chevrolet Malibu Classic) has the same engine, and I haven't yet changed the oil on it. Neither of these cars were low on oil that I could tell, although I didn't make a point of checking before I drained it. While I was under the car he said, "Is there anything wrong with using the $1/quart oil?". I said, "The point is to avoid doing this as much as possible, so the $2/quart oil is what I suggest".