I got my 2002 sentra 1.8 4 years ago when it has 18k miles. Now I have almost 150k miles and I've tried all kinds of oil... Lately I've used GC 0W30... then tried Amsoil 0W30, then I mixed 50/50 Amsoil 0W30 with PP 5W20.. I don't think my car liked it too much so this morning I removed some of the oil and added Rotella T 5W40 to thicken up the mixture a little. My car seems to like oils in the 11 to 14 cSt range at 100C.. but I want something that is as thin as possible at start-up, most of my oils are above 60cSt at 40C and I want something thinner. If it helps, here is my latest oil analysis, since this I have added subaru coolant conditioner.