Hi Lads, What motor oil do you use in your DeLoreans? When I was in the USA I always used Valvoline 20w50 fully synthetic. Now back in Ireland, the only fully synthetic oil I can get is 5w30, 10w30, or 5w40. Any suggestions? Also, how often do you change your oil? When in the states I did it every 3 to 4 thousand miles, which was a bit of overkill, but now it is 5000 since my last change, and I don't want to take this really good oil out until I find something good enough to replace it with. Thanks for any help. Best wishes, John Dore, Ireland.