[tofu1413]

Originally Posted by underscore

jebus, I've just been changing my oil when it looks dirty (I leak/burn a bit though so it gets topped up fairly frequently) which is probably around 5k or so. My g/f felt bad about how dirty she let the oil in her car get, but after reading this now I know we should both be able to go longer. I think I'll do some of those tests soon.

Here's my question: I was told to avoid Quaker State and Penzoil because they have wax in them, which can build up in the engine (oil pump intake etc). Truth or fiction?

half truth half fiction.

it was the old pennzoil from way back that causes it. Pennzoil/ Quaker have some pretty decent stuff for the money.