Rich, This is a cut-n-paste of our recommendations from a guide we are finalizing. Let us know if you have any other question.
2.0 Break-in procedure
The importance of properly breaking in an engine is to allow heat stress from the manufacturing process to be relieved and for proper ring seating.
We do not recommend the use of synthetic oils for break-in as in rare cases the lubricity could prevent proper ring break-in.
After properly installing the engine:
· Add 14 ounces of a high quality 30 weight automotive oil. Only during break-in do we recommend the use of automotive oil. Never at any point in the life of your engine do we recommend the use of ‘karting’ oils. These products use base materials that have severe limitations and offer very limited protection over time.
· Assuming that you can break your engine in on the race track preceed to put 10 minutes of varying rpm on the engine.
o You are not racing at this point and simply allowing a slow progression of increasing the rpm and range during break-in.
· After 10 minutes of slow track break-in shut off the engine allowing it to cool somewhat.
· Repeat with another 10 minutes or so of varying rpm on the track.
· At this point, with your engine shut off drain the oil while it is still warm.
o Note your oil will be over 200 degrees and care must be taken.
o The reason behind changing the oil while warn is an asperities from the break-in process will still be suspended in the oil.
· Again adding 14 ounces of oil repeat this cycle.
· After 2 addition track sessions of slowly increasing the rpm and range, your oil should be changed out once again will warm.
· At this point we recommend only the use of Briggs & Stratton 4T synthetic race oil custom blended by Amsoil. Briggs 4T race oil has been engineered exclusively for the firing pressures, temperatures, and splash lube system of your engine.