After driving around Copenhagen for some years I finally reached the point where I trust my old 1941 U enough to take it on a long trip through Europe.
This means driving longer and faster than we're used to. What sparkplugs would you recommend for the trip? The engine has new aluminium cylinderheads from Flathead-Power. This means small diameter thread.
Currently I'm using Splitfire SF426C and Champion N12YC.
Another Question: I normally use 50 mineral oil, but is there any other oil I could use on the trip? The kind you could by on a gas station? Otherwise most of my luggage will be oil
Thanks in advance