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Here's a pic of the vehicle in question, a Nimbus Model C. It's actually a 1952, but the engine was first manufactured in the 30's and the design didn't change until end of production on 1960.

Quote: I wouldn't use a non-detergent oil, but I would drain it every few hours of operation to see how quickly it's cleaning the sludge. The operation you did cleaning the sump with the diesel fuel was probably pretty effective. But the first oil fill after that may be subject to thinning if...

Quote: And does the engine have sludge? Have you seen it in the engine? When I first drained the oil, the wire mesh oil filter (which is integrated into the oil drain) looked like it was covered in elephant snot. So after draining the oil overnight, I poured a couple of quarts of diesel fuel...

First post from a new member. I'm putting a vintage (1930's) vehicle back on the road and would appreciate the forum's collective wisdom on engine oil. The engine is an air cooled, in-line 4 cylinder that shares its oil with the transmission. The clutch is dry. The engine has a crude, wire mesh...