I've always heard and continue to read that you should use dino oil on break in. What I haven't heard is the real reason why. Now I can see a small arguement about the rings not seating properly, but if you put the car under enough load and vacuum when the hone is still fresh I really don't see how oil is going to inhibit proper ring seal.

For all other areas of the engine why do you want lesser oil? I was under the impression that I DON'T want anything to "wear in". I'd prefer my metal surfaces not to meet.

I want the best I can put in my engine from the start and if there is a real reason to use dino oil then that is fine, but I want some actual proof.

 

Getting ring seal is very critical and hard to do on imports.Ring seal is best achieved with high cylinder temps and lean af ratio.The pistons like a fine cylinder finish.The oil control ring likes a fine finish.But the second ring is really what keeps oil out of the combustion chamber.This ring needs a rough surface to bed in.Try installing them upside down and see how much oil you go thru.Just because synthetic is more expensive doesn't always make it better.Standard oil does a better job pulling heat away from metal parts than most synthetics.This is part of the reason that the oil temp is lower when you change to synthetic.The engine isn't actually running cooler.Standard oil will hold particles in suspension better so the filter can trap them.Ive seen engines run on synthetic and they are typically dirtier than standard oils.Sorry about the long post but I go thru this about once a week.Start with a standard oil,change it about 300 miles and again at about 1500.Then change to synthetic if you want.The blends are the best bet,best of both worlds.
Glenn

 

to keep it simple, syn. oil is too ''slippery'' for the cylinder walls to sand down rings to fit and seal

 

Sorry guys, but this isn't what I'm looking for. I want hard evidence that synthetic oil prevents the rings from sealing.

Show me proof that standard oil holds particles better than ALL synthetic. I think this will be hard to do considering each can be formulated with different additive packages.

I plan on running Amsoil if this helps any.