Air coming through the valve cover
Why would you drop the good synthetic oil for a low to no zinc diesel engine oil?
I'm not saying to drop it.
I'm saying he has way more oil than he needs, and he's paying hard for it.
And the RotellaT (just an example, one of many, do your own research) with added zinc, is more than adequate for his combo.
Then I added a link to begin the research.
Like I said; I have been adding the zinc additive to sometimes,cheap,on-sale oil, and stuffing it into my 400Plus hp engine since 2004, and the engine seems as strong as ever.
I repeat; do your own research.
I service 6 to 10 cars in my fleet, and full synthetic oil is waaaay out of my price range.Especially so, since I know my recipe works.
and finally; once again;
I am not against his oil. I am against the grade he is using.20W50 is some pretty thick stuff at room temperature, never mind at below-freezing temps. And at 150*F, it takes a lot of energy to jam it through all those little passages everywhere inside the engine. And the faster you spin it, the more energy it takes.Then it takes longer for it to drop back into the oilpan. That's what I am against.
And that is why,partly why, I have a 7qt oilpan on my 367. I know that the SBMs have a history of piling up the front rod bearings when working hard if they don't get enough oil. It is better for them to get lots of thin oil, than not to get enough thick oil.
One time I even ran 5W30 in my little 367.
My 367 has had several oiling mods done to it, and has been happily buzzing up to 7200 since 2000, when I first found out that it could.It has never even smelled synthetic.