There are a lot of different opinions on this subject for a lot of different reasons. Some are fact and some might have been fact at one time. Here’s the story.

Engine manufacturers have constantly improved their products as far as machining techniques. Tolerances and fits are much better than years ago. Most gasoline powered engines are pretty much broken in right away. You can tell this by the fact that thee is very seldom and oil consumption on a new car any more. Years ago the manufacturer used to recommend driving a certain speed for so many miles and then go faster etc etc. You don’t see that any more either. At one time there was actually a “break in “ oil used.

Keep in mind, engines will break in and piston rings will seat in engines using synthetic motor oil immediately, just somewhat slower. Cars such as the Chevrolet Corvette are coming off the line with synthetic oil in the crankcase. Diesel engines and remanufactured engines are the exception. Diesels break in slow because of the extremely robust components in them. It’s the nature of the beast. Reman engines often are not machined with the same precision with which the manufacturer builds them originally, and henceforth may require more break in.

We get asked this question every day. We spent a little more time explaining this for you because it seems there are several people looking for an answer. We hope this helps. Generally when someone asks this question we have a quick paste in answer which we’ll include below for you.



You may switch to AMSOIL at any time. However, all new engines have a certain amount of machining debris and contaminants. You may wish to capture these unwanted items in a less expensive oil and filter, and change it sooner than recommended. The exception would be Diesel engines or remanufactured engines for which a longer break in period with petroleum oil may be needed.





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Sent: Thursday, April 05, 2001 3:57 PM
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