jerry_m said:
It's possible that a 'fact on paper' is different from a 'fact in real life'. But at least 'on paper' BRM calls for 4.5 quarts what I'd say is 'normal' for a flat tappet PD. PDs with roller followers call for 4 quarts 'on paper' I guess to fill them takes even less.
Thank you so much for keeping on this track jerry. I now understand so much more about soot levels than ever before. I have looked at posted OA reports and wondered why the soot content seemed to stay so regular. The oil changes leave so much oil in the PD engine. I had no thought of all the hidden oil that was in the engine till you kept pushing the issue. If we were to get the engine to a dry state it would actually require quite a bit of oil.
Owner one makes sure to get the engine quite warm, let it drip for 10 minutes, and clean out the oil filter cannister and maybe even blow out the oil cooler (probably not) etc. He gets most of the soot out.
Owner two just changes the oil luke warm and leaves no telling how much oil clinging to the inside of the engine. A lot of soot remains in the engine.
Then we argue about how much oil it takes to change the oil. The dipstick may give you an answer but quantity is also an issue. Jerry has a point. How much oil is supposed to be changed? If you get a fill with less oil then maybe you are not draining enough oil out of the engine. The engine may need to be warmer or let drip longer or something I am even not thinking about.
If you get a super drain and throw in 5W-30 oil your viscosity is way low.
If you use 5W-40 oil the viscosity may be higher.
If you get a poor drain your 5W-30 oil if fortified with soot and you actually have higher viscosity oil to start with. If you use 5W-40 oil you really have a good high viscosity oil. Soot fortified oil is a high viscosity oil. IMHO
Look at those OAs again and see where you fall. Which is best? I lean toward a good clean drain and 5W-40 oil.
And to apply all this to BRM failure, which oil changes are really having something to do with the mileages you get out of the BRM engine? The worst mileage may be the 5W-30 super clean oil change done at 7,000 miles US. That would leave a super low viscosity oil. The BEW at least had 5W-40 oil most of its life.
All the chatter aside this was a good sharing conversation you all had. Thanks again jerry it would have not happened without your keeping on.
eddif