roby: Like you said....a lot of intersting stuff here.....turned out so deep I may have to wear a pair of hip boots when I turn this computor on!!!!! Hey, I had many new chainsaws ect and broke them in at least a little. A Chainsaw actuallly is broken in under good conditions. Normally the opertor will run it on the rich side. He will always let it warm up and get oil on chain. Also a chainsaw gets a rest quite often. Operator has to move limbs and refuel and restart quite often. I take it you kinda like synthetic so much for break in. It may be the best way for certain engines....but not all. I think the bottom line is you got to go by what your manufactor of the engine you bought, so the warrentee is valid. Captinjohn