As title really, google seems to be throwing up 15W40 but this is different to what the previous owners were using, however they didn't seem 100% and there's no vehicle handbook to check in!
TIA
V
Is there not a proper garage locally, for an old engine you want the older type of oil, not that for modern hi spec engines. I have bought tractor engine oil for an old engine, but that's no help if you don't know where to get it.