well im sorry that I hit a nerve of yours sean,
You didn't hit any of my nerves. But lots of people read these forums, and an otherwise neophyte might read your post as if there was something behind it, and they deserve to hear, first, the recommendations of their engine manufacturer.
my comm on oil was just that, and you or anyone elese can run what they want in there rig,
Well, that's not how it reads, at least to my eye:
"if you use a good oil like synthedic rotella ..."
the implication being that non-synthetic Rotella is a "bad oil" or "not as good" or whatever, even though Shell themselves recommend the non-synthetic product for Detroit two-strokes
"... you wont have to worry about problems like that"
Again, the implication being that Rotella Synthetic, in a viscosity not approved for Detroit two-strokes, will alleviate the concern about journal bearings on a dry crank, and is, therefore, somehow better than the high-quality conventional oils most of us run.
You're certainly entitled to that opinion, but newcomers deserve to hear that it is not the consolidated wisdom of tribologists in general.
I myself have run rotella in all my diesels , cummins, perkins, izuzu, vp maroiti, powerstroke, and a few others im sure I cant rem,ive run rotella in all of them and never have I had an oil related issue, I own 4 dump trucks 1 bobcat 2 backhoes 2 dodge rams with diesels and a jeep liberty with a diesel in it, I have logged in well over 2million miles of driving with rotella and 10s of thousands of eqp hrs with it also, so for me I think ill stick with the rotella
Well, most of those engines and vehicles are four-strokes, which is not what we were discussing.
I run Rotella myself. But I use the recommended straight 40-weight, which does not come in synthetic.
The diatribes of anecdotal evidence are unpersuasive -- everyone has stories of things working just great, for them. There are boats running around the Caribbean even as we speak using distilled water in the coolant loop, rather than anti-freeze. Anecdotally, they have thousands of hours of experience that says antifreeze is not needed. That experience becomes meaningless the minute the engine is in freezing conditions -- conditions those operators never experience.
It's quite possible you've been running 15W-40 or whatever else for years without deleterious effects. I don't doubt it. But Detroit has billions, not millions, of miles of experience with these engines, and they make their recommendations for good reason. I, for one, will stick with them, notwithstanding anecdotal evidence that the recommendations might be overly cautious.
I'm not telling anyone to follow suit. I just want any visitors to this thread to hear both sides of the story, from which they can draw their own conclusions. FWIW.