Guy i ride to work with just bought an '05 Malibu with the 2.2 Ecotec, 118k miles, for $400 from his brother. Nothing wrong with it, his brother just needed the cash. I just changed the oil today, it had about 15k on Pennzoil Conventional 5w30 form the local quick lube, the guy was not very good at maintaining it. Had a good bit of varnish buildup in the filter housing and i hadnt been changed in so long the filter was seized in it.(got it out with pliers) Drained maybe 1.5 quarts out of it and used 5 qts Valvoline 10w30 conventional and a Napa gold filter. Is this a good cleaning oil? Gonna do 4k ocis, its a work car, 50 mile round trip to work, 7 days a week, every other week. It runs fine despite the neglected oil change, those ecotecs seem pretty durable.