Re: New Motor break instruction
20 Hour Break in:
Minimize operation below 1500 rpm for first 10 hours. Don't stay at one engine speed constantly. Don't exceed 3/4 throttle for first 10 hours.
For next 10 hours, can have short full throttle but no more than 5 mins. per time. No full throttle burstst from idle speed. No WOT until engine fully warm.
Check oil frequently, and top as needed.
After break in:
Make sure engine can reach WOT under normal load
Dont' constantly run at WOT
Change oil and filter as specified.
The above is paraphrased from my 2003 4.3L MPI owners/maintenance manual.
