The car is an '89 1700cc xflow. When the previous owner had the car, the engine went bang (some kind of oil loss issue) some 5000 miles ago. The engine was rebuilt and upgraded by a known engine builder and has been going fine ever since. I have stuck with the oil the previous owner recommended, magnatec GTX 10w-40, as it is what the engine builder told him to use.
However once the engine is hot, the oil light tends to come on at idle and over the last few weeks, on the hot days its noticeable I don't have to be giving the car any stick before the oil light comes on at idle. The engine seems fine, no strange noises, smoke, rattles - it just seems once warm the oil pressure just dips below the warning point at idle. I'd like to track day it but I'm concerned that the current grade oil may not protect it since the engine is going to get hotter still.
I have read through the numerous thick, thin, fast, slow, oil posts in the archives and still haven't reached a firm conclusion about what I should do- so I'm posting.
Mobil 1 15w-50 seems to get a thumbs up, so that is a candidate, but sometimes I do have the odd cold starting issue so I don't know if going from 10w to 15w will make that worse.
As its seems to be on a BOGOF at the moment, what about the halfords 5w-50? is that just completely out for an xflow? Is there anyone happily running their xflow on this grade?
cheers.
Edited by - techbod on 9 Aug 2007 22:32:19