internal engine enamel

[rotorwrench]

Oil soaps are a very sticky substance. I've only seen really bad deposits of soap and sludge on engines that are never completely warmed up during operation or ones that use strait mineral oil (break in type oil non-detergent) all the time. Engines that are run with detergent type oils and warmed completely up every time they are operated generally stay pretty clean inside but bare cast surfaces really catch any type of soaps or sludge that is produced. In that respect, the internal coating probably will be justified but only if a person uses the vehicle so much that they routinely have to open it up for overhaul. If a guy is in the engine rebuilding business then I can see one good reason for using it. Some folks take years to finish restorations and the engine may sit for a very long time. In that case it would keep it from rusting up in a place with high humidity and possibly causing warranty concerns. In that case why take the chance plus it does have a good look to it.

It's just plain up to each individual. Not a "have to do" thing but not a "must not do" thing either.

Kerby