Originally Posted By: MarcS
Originally Posted By: UltrafanUK
Originally Posted By: vitez
I've used Amsoil Engine and Transmission flush in the last 5 used vehicles I've bought and never had any engine issues.
http://www.amsoil.com/shop/by-product/ot...?code=FLSHCN-EA
If your engine still exhibits some sludge after 25K of M1, I would do an engine flush. The Amsoil product is a detergent, not a solvent, and extremely unlikely to break off big chunks of anything. Besides, by your description you don't have big chunks of anything anyway!
I agree, using a flush designed for use at idle would get the block clean far faster than just doing short OCI's with a good cleaner oil.
Just concerned something like that will send any remaining sludge right back into the problem areas that were just cleaned or replaced. Most of them have warnings abot using on heavily slidged engines and I dont know what they consider "heavily sludged"
The only warning from Liqui Moly is for the use of their drive around flush, not their idle use ones. It just recommends that you clean the sump and oil pump intake before use and keep the revs low.
If removing the sump is difficult, a lot of Indy garages just rinse the block through with diesel before using an idle flush. In a bad case like yours it is worth doing a double flush.
If you have an oil leaks, changing to a high detergent full synthetic or using an idle flush can make oil leaks worse, as the sludge and varnish can help old worn or split oil seals or gaskets work (It's called the false oil seal effect). In a bad case it might be best to use an HM oil or even some stop leak as a precaution after flushing.