Re: Breaking in an engine. What oil to use?

Posted by IH Rob on September 16, 2004 at 14:01:32 from (156.101.1.5):

In Reply to: Breaking in an engine. What oil to use? posted by JBlavl on September 16, 2004 at 10:49:19:

OK - Here's my couple of cents worth. I have been in the trucking industry for quite a few years, and have rebuilt a fare share of diesel engines. I have never broke an engine in with synthetic for the same reasons the other fellas mentioned. Here's the scoop on synthetic oil - it IS much better than regular oil. Why do we change oil? Because the viscosity starts to break down, which causes it to lose it's lubricating qualities. Also because it becomes contaminated with engine wear particles, dirt, and soot. Synthetic oils retain their viscosity for much longer than standard oil - therefore everyone thinks that you can go twice as long between changes. It is my OPINION that you shouldn't do this. The synthetic, although retaining good viscosity characteristics, still gets the contamination that normal oil does. You can usually go a little longer between changes, but I always recommend that oil be changed on regular intervals - synthetic or not. Diesel soot is the most dangerous "normal" contaminate. At 5% soot level, the oil is basically sludge. Synthetic just makes it slick sludge. In a nutshell, synthetic will make your engine last longer, but should still be changed at the same interval as normal oil. Make any sense to you all? Again, just my opinion.

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