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That is odd. What brand of oil filter are you running?

I would also not add anything to the oil as a means to clean an engine. There's actually a much easier and safer way. Just run a Group V synthetic oil. The esters that make up a Group V synthetic oils base stock also make excellent detergents. Just run a Group V synthetic oil for a season or...

I would not run any additives in the oil. They tend to change the viscosity of the oil into 15w-?. I ran Lucas oil stabilizer in the transmission and rear end of my 31 Ford model A for one season. I changed it right after I had just got home from a short trip. I was quite surprised to find...

It's not the brand but the numerical reference of the oil that mattered. Chevron Delo CF-2, and CF-4 were produced at the same time. The 2 and 4 does not represent a time scale reference, but rather the application in two or four stroke diesels. Chevrons Delo was prefered for use in two...

Unless your engine has been running oil from the 50's then there's no real benefit from flushing it. However if you do still feel inclined to do so Napa sells an engine flush that has the consistency of 5wt oil... Probably your best bet.