[QUOTE="Pip"] Petrol, I suspect. I just did something that I should have done already and removed the filler cap for a sniff. I got Elly to whiff it too and we agree that it doesn't smell just of oil, there's something a bit "spirity" in there too - quite a sharp small, unlike used oil and much like the proper poster paint that comes in jars.[/QUOTE] I believe Darsy does an oil tasting service, might be worth a shot.