Originally Posted By: OldEuroCarLover
Originally Posted By: MolaKule
For neglected engines, there are a few products out there that will clean engines.
Based on your numbers of posts, it looks like you've been here for some time. What, in your opinion, are the products that will actually clean an engine? I'm having a hard time finding objective proof of anything. Or even strong evidence. There are a few things that I'm rather confident will keep an engine clean, but I don't know what will clean one once it's dirty.
(Just saw the date, too. Didn't realize that was on this forum. You
have been here a long time.)
We need to define clean.
If you want to maintain an engine's cleanliness that is say clean from the factory, use any modern high quality oil and filter and maintain the Pollution control system. Replace oil and filters at the Severe Service Interval defined in your OM.
Forget about STP and motor honey and others. These are for smokers.
If you have a neglected engine that is poor in performance and is sludged, products such as LC20 and Rislone Engine Treatment can added to the oil to remove sludge slowly. It depends on how hard the sludge is and how long it's been there.
If you have evidence of a carboned up engine, you can also try the "Flushes." These are added to the oil just before oil change. Do not leave these in the engine. Some such flushes are Berryman's B-12 and the Amsoil Flush -
http://www.amsoil.com/shop/by-product/ot...smission-flush/ .