G’day Gary
When I suspect there is junk in the sump I normally dump the old oil, and then, after filling with new oil, run the engine properly up to temperature and then dump that oil too. If I’m helping rescue an old piece of machinery we’ll use inexpensive but correctly graded oil and might do a couple of flushes before putting in better quality stuff. Normally crank cases are not dead flat along the bottom. There’ll be crevices and crannies, where stray bits of stuff collects and a flush process cleans them out.
Some engines may take quite a while to get up to temperature. I’d give it 15 minutes. Short running exacerbates issues as you need to get heat in to burn off the carbon deposits from choked operations on startup.
We had an old grader with a big old diesel in it that needed 20 minutes of decent time working before the thermostat even got close to opening.
Water won’t necessarily manifest itself as that stereotypical mayonnaise-looking emulsification. That’s more for water cooled engines where there’s total mixing such as with a compromised head gasket
It doesn’t have to be water in the oil either it can be that the oil itself has begun to break down. It could be that, in the past, some fuel got into the oil too. There’s some not so flash designs about that can allow it to happen more readily than it should.
I’m assuming you checked that no insect or other bug has made a home for itself in the intake or exhaust? Mudwasps in the exhaust can lead to interesting effects.
Last edited by Ironbark; 11/03/22 03:20 AM.
