going from regular oil to syn oil, do i have to flush out the system with something to add in the syn oil?

 

nope. The synthetic oil should sorta flushout any residues and such from convential oil after the first change or two. You might want to do your second syntethic change earlier than you might usually do it to sort of "complete the flush".

 

I switched to synthetic this past spring. I like it a lot more,,,,,,,, takes awhile to flush out deposits etc if you have a lot of miles on the motor. Maybe 4 or 5 changes. Does not hurt anything just dirties the oil.

I do plugs with every change too,,,,,

 

wow thats awfully often.