This is my two cents on engine flushing. Before I do it on a Mercedes diesel I drop the oil pan and clean up any sludge. I then paint the inside of the oil pan with either Glyptal (available from Eastwood) or POR-15. I then reinstall it and of course replace the oil. At the next time it is due for an oil change I flush the engine. If you have a lot of sludge in your oil pan an engine flush can cause too much debris to go to your filter which in turn clogs it. Then you have that extremely filthy oil which is not filtered circulating. By painting the inside of the oil pan the surface becomes too slick for deposits to form causing it to be picked up by your filter. Just be careful during future oil changes cause it really shoots out when you remove the drain plug. By the way Amsoil is available online with direct shipping to your door.


Andy