Who can I trust to change the oil in my car? One place I called didn't want to know the make or model of car, as if they keep every filter for every car on the shelf. Another candidly told me they'd suspended oil changes until they could get their waste tank emptied (whether for cost or environmental reasons he didn't say). The last time I had it done, the dipstick looked every bit as treacly after as before. At this rate I will end up doing it myself (rather than insist on watching them, thus engendering an atmosphere of distrust).