I've been using fully synthetic 5w40 in my 1.8DZ for some years now. it's done about 145k. seems to like it. oil doesn't get dirty at all, starts fine in -10C & engine warms up quick.
I know it's wrong, but have been using tesco oil which was £10/2 litres i.e. £20 per full oil change & leaving 1 litre for top up if necessary. budget issue for me - Halfrauds synthetic 5w40 (which I used to use) is about £36 for 5 litres now & haven't been convinced that Halfraud's own brand is worth paying £16 more for an oil change
any thoughts on this ? I know that lots of you are well up on your lubricants
am I risking anything by running fully synthetic 5w40 in a 22 year old motor ? haynes manual suggests 15w50 or 20w50.
& as for the fact that it's tesco own brand, can this really be any worse than Halfrauds own brand ?