Originally Posted by
drift mekanik
I ran it in on 10-40 semi synth.... but did not get many miles under its belt before the change. I did not fancy running at high revs on normal 10-40. Maybe that was a mistake.... but I will just have to learn from it.
It was idling for about 4 hours (2 hours sat, and 2 hours Sunday) then only drove about 150 miles before the oil and filter change.
If you run an engine in on constant revs, or idle it will severely affect performance. You generally find engine run in on idle do not rev well and well down on peak power, when taken to high revs they can frequently be unreliable. 3/4 of full throttle with no position held for too long is general rule of thumb for running in and a low grade oil is absolutely fine, even a cheapo mineral oil is good as it allows all the components to bed in properly. If the oil grade is too good during running in you tend to get an engine that has a heavy oil consumption in future life.
The only reason we don't have oil changes at 1000 miles and running in now is cost, nothing else. manufacturers dance to the fleet tune. Same reason why service intervals were stretched, oil expected to last longer, brakes stopped wearing etc.