Your plan sounds as good as any otherThanks for the link. As with every place I've looked it lists two, M14 and M12, dealer said 21mm and 28 mm, no one seems to know. I expect I'll have to drop the oil and take the plug out to see which one is in there. Then rush of to buy one while the oil drains out.
Ah well. Thanks again for your reply and the link.
Yeah, we always allow it time to drain, while we have a cuppa lol.The longer you drain the old oil the better,did mine new years eve and 468 miles
later my oil is still clear.