Originally Posted by
Mal.
If you remove and clean your rocker cover and sump then fair enough. But sometimes the flush can dislodge otherwise harmless lumps of shite. As a case in point my uncle ran a flush through his rover diesel and within a few miles suffered camshaft failure due to oil starvation. On stripping down a lump of what can only be described as varnished oil residue had blocked the oil way. I've also read on t'internet pretty much the same.
If your uncles car had been properly maintained using decent oil in the first place this would never have happened.
You cannot keep the oil clean FACT, you burn fuel which is fossil fuel you produce carbon, simple as that, some gets past piston rings and turns the oil black, higher compression on diesels means more blow by rings more carbon more black even quicker.
You can slow down the process by ridding the internals of all the varnish etc from the oil that has accumulated but never 100%.
I use WYNNS, it is very soft and leave it in for 200 miles before oil change, never a probe in 20+ years.
tabetha