i use to do it at 1000 miles but i have been informed 2000 is a better # to do it at .conszx said:I'm currently running conventional oil on my new motor during break in. And I was wondering when would it be the right time to switch over to synthetic motor oil?
I currently have 1,000 miles on the new long block now.
I say going to added mile to ensure the engine is properly taken care of my a few extra oil changes is no big deal. Also considering that built engine packages (e.g. from Dart, and many other companies) often recommend dino oil for the first few changes, why not "drop the pan"a few more times so you sleep better at night?cord4530 said:Carchitect,
Great to read your post about using synthetic for break-in. It seems to be common on the internet for everyone to say "Don't break-in with synthetic...keeps your rings from seating." But I wonder how much of a myth it is, and it's just spread to the point that everyone believes it. Considering how many engines you've put in, that seems like a fantastic data point! Thanks for sharing-
My point exactly. The conventional oil that I use for the first 50 miles is there only for cleaning out the assembly lube. I don't like to leave that stuff in there feel it can cause the oil to degrade quicker than it would by itself. Its mixture with the oil may not be 100% compatible for the filtering elements so for those reasons I flush it out as soon as possible. The first 50 miles helps me tune in the AFRs and I won't need to worry too much about an overly rich mixture washing fuel into the oil. Sometimes an overly rich mixture is unavoidable since overly lean isn't very good. So I might start out a few cells of the map pig rich and then lean them out. Usually once the fuel is done is when I change out the oil and proceed with the tuning the timing.Kal said:.....why would you blow a $25 case of synthetic oil on that.