Hello all, I'm working through the things to do list on my recently purchased Mk2 pick-up. First on the list is the obvious oil and filter change. The oil specified for the Pinto 2.0 is between 10w30 and 20w50, but here is my problem. I'd like to put in some 10w40 oil because of the very low temperatures we have here (often -15 or lower) but the Castrol classic oil that I use in some of my older cars is 20w50. The engine is from 1979, should I bother treating it as a classic? I thought about putting in some ordinary 10w40 Castrol GTX semi synthetique oil. I have no idea what oil was used before. Any thoughts or experiences on this matter?
Chris.
PS:- Tried doing a search for this but you can imagine what comes up when asking 'engine oil'
PPS:- I only use Castrol to limit the amount of half full or nearly empty oil cans that I used to have lying around if you know what I mean.