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Re: Very OT - 0W-30 oil
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Posted by txblu Rest of story on June 09, 2004 at 12:13:38 from (199.46.199.233):
In Reply to: Very OT - 0W-30 oil posted by Ron on June 08, 2004 at 16:10:50:
I just came from www.mobil1.com and read the ad for 0-30 and also Delvac Super 15w-40. The 0-30 happened to mention ......."where this viscosity is recommended" and the Delvac said" specially formulated for heavy duty diesel engine service". Curiously enough, there were OEM engine mfgr's approvals of the Delvac super in 10w-30 and 15w-40. All HD diesel engine mfgr's recommended the 15w-40 for their engines, but several declined to recommend the 10w-30. There's a message there. So while I'm pondering the question of surface tension and what relationship viscosity breakdown has to an engine, I realized that with 0 psig of oil pressure the oil will NEVER LEAVE THE PUMP. You have to have oil pressure to get the oil to circulate. So for worn engines whose tight bearing tolerances are no longer tight, you need viscosity retension to keep the oil thick enough to pump and thick HD oils do just that. Just proved it again last week on a '64 worn out MF 35 diesel as posted on this site. my 2c. Mark
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