50w oil versus 40w

[wg4t50]

Barn Owl, If you check with Jay or Fred Abbott, Abbott Bus Lines, Roanoke,  and your running a 8V92, I am sure they will tell you the rest of the story about the need for the 50wt in the 8V-92, Its all about the rear main issue.
Cheers

[buswarrior]

I'm thinking that if a busnut started to tell the difference on the rear main bearings which oil is put in the engine....

It would be getting expensive.

Unfortunately, the excellent engineering support for our engines, which we had grown accustomed to from years and years ago, stopped keeping up a long time ago. The many decades of engineering discovery for the 71 engines simply didn't happen for the 92 engines. Detroit Diesel moved ahead with 4 strokes, and started ignoring 2-strokes an awful lot of years ago now. Think of the 92 engineering experience story as unfinished in comparison?

I fully expect that if the world had continued along the original path, that Detroit Diesel would have done the engineering tests long ago and be telling us via those traditional engineering notes, which of today's oils to put in our engines today, and why, in no uncertain terms.

There isn't anyone to do the testing. It is simply too expensive, with insufficient return on investment.

However, if someone running enough miles a year, like a motor coach company, using ground level belt and suspenders engineering, has found you get more miles and less failures from the rear main on an 8V92 by simply moving up to a 50wt oil, as busnuts, perhaps we best pay some attention?

Price spread between 40wt and 50wt?

Price of losing a rear main bearing?

And the side benefit of a little less oil consumption, or leaking, and a few more pounds of oil pressure at idle?

I think the hobby just got given a very expensive gift for free.

happy coaching!
buswarrior

[bobofthenorth]

Yabbut .......

Out here in the real world its getting nigh on impossible to find single weight 40W - good luck finding 50W.

[robertglines1]

Just checked my bearings with aprox 100,000 miles on them  . they were 1/10,000 under new. run 40 wt straight and change to often.  including mains and rods.  Bob