Originally Posted by Daily Driver
How well does "Motor Flush" work? Has anyone seen research on this product? How wise is it to release these deposits? I used it once in another truck years ago and had no apparent problems. No apparent benefits either though.
Over the years, seals, guides, gaskets, rings, etc all wear, this is normal, however the signs of this wear are delayed by sludge and carbon build up. Motor Flush does a great job at cleaning this, too great, which is why you have people like the last poster, complain of it using oil or killing an engine. It loosens large deposits, which clog the oil pump screen, starve the engine of oil and then you have a dead engine. If it doesn't clog the screen, it exposes leaks that have been there for god knows how long, but covered up by sludge.
Using diesel oil will help to SLOWLY and SAFELY remove sludge build-up over the course of many oil changes. I have a 30 year old Pontiac V8, that has never seen a rebuild, valley pan was completely sludged, within the last three oil changes, the amount of sludge in the valley pan is greatly reduced. Every time I drain the oil pan and remove the oil filter, both show me little spots of sludge. I run Mobil1 0W40 Turbo Diesel oil in the Pontiac and Shell Rotella T 10W30 in the Mazda B3000.(Which now has 131,000 miles).
If you cannot wait that long, buy AutoRX, it is a type of motor flush/oil treatment, that is not as quick as kerosene in a can, and not as slow as using diesel oil.
Sludge will eventually kill an engine, don't put it off because you may uncover a leak along the way.