Posted by dej(Jed) on December 22, 2011 at 04:50:15 from (141.189.113.1):
In Reply to: 30W versus 15W-40 oil posted by GordoSD on December 22, 2011 at 03:38:44:
I use 30w Castrol in everything. I even run 40w in my 99 powerstroke.
Here in western , pa we don't see really low temps though. A good oil treats the metal surfaces enough that they should be protected from wear when you start up cold. Heck I accidentally ran a Grand Cherokee 9 miles with no oil, added 5 qts and had no problems for another 100K miles. A typical 5/10/15w x 30/40w oil thins out so much that it actually causes more wear than a good 30w ever would. I don't know how the old tractors ever survived running only straight weight, unadditized, base oils for years. LOL. Multiweight has been a valuable marketing tool and it has resulted in increased sales for years now.
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