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

Posted by Ron in Nebr on September 16, 2004 at 11:37:06 from (65.172.143.29):

In Reply to: Re: Breaking in an engine. What oil to use? posted by Nebraska Cowman on September 16, 2004 at 10:59:36:

Like the above posts indicated, an oil change is cheap compared to an engine, no matter what kind of oil you use.
But I have to admit that, even though I"m an ex-professional mechanic and should know better, I tend to put off oil changes longer than I should too.
But, to answer your question, I"ve heard many professional engine builders say that you CAN break a new engine in on synthetic. But- they also say it"s better to break it in on dinosaur oil because it"s not really cost-effective to break them in with synthetic, since you MUST drain the break-in oil out within a short time, because it will contain all the dirt and foreign particles that will be in the engine after a rebuild, no matter how much care was taken to keep things clean during assembly. Along with this foreign material there will also be a small amount of metal that will be in the oil due to the "breaking in" process of the new rings, lifters, etc.
As a final thought, if you DO decide to run synthetic, it"s been widely proven that you CAN go longer on oil changes, often twice as long, BUT, the key to doing this successfully is that you HAVE to continue to replace the filter and add a fresh quart on a regular basis, at least as often as you"d change oil with regular oil. The filter can and does get plugged just as fast with synthetic oil as it does with dinosaur oil, and the fresh quart(or however much the capacity of the filter is) will replenish the additives in the oil.

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