[Cuda340]

I have been researching the web for expert advice for engine break-ins. The consensus is to let the engine warm up. Then, drive normally but not a continuous high speeds for the first 500 miles.

Occasional quick bursts of speed followed by quick deceleration during this period, is beneficial. Applying loads to the engine for short periods of time causes increased ring pressure against cylinder walls and helps to seat the rings. This is especially important because you are "BREAKING-IN" the engine with heavy duty oils. The rapid deceleration increases vacuum and gives extra lubrication to the piston and other assemblies.

If the wrong type of oil is used initially, or the break-in is too easy, rings and cylinders could glaze and never seal properly. A fresh cylinder wall needs some medium to high engine loading to get the piston rings to seat properly.

Most of the engine experts warned of the danger of breaking in the engine too easily and ending up with an engine that will always run slow (lose 2-10% power) whether it is from tight tolerances, inadequate ring seal or carbon buildup.

Also, after 500 to 1,000 is is important to change the oil and filter. (You can switch to synthetic oil but not before the first oil change).