Quote:
Originally Posted by SkullWorks
Ummm...no no old geezers relied upon,
Engine builders/ Dyno Operators/ All professionals.
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^This.
All the Honda engines I rebuilt I used dino oil to begin with, then switched over to synthetic after so many miles. My last engine I built, which also happens to be my current engine in my EH2, I actually used basic non-detergent oil for the first 2 changes, then regular castrol dino oil, THEN finally synthetic. I beat the shit out of the engine for the first 50 miles.
My compression on this engine is the highest I've ever had on all my builds. This isn't only my experience, but many other Honda builders have proven the same results. These aren't old engine builder tales. The science is simple - synthetic is literally too slippery for rings to seat properly. Rings need friction to seat, which is the reason why cylinders are honed at a specific grit.
Now, a new car will be different. The manufacturer WILL have done a short factory break-in/bed-in procedure before the engine is even installed in the chassis. This may or may not be enough to have the rings fully seated.
Do what you want, either way it's not going to make or break your FR-S/BRZ. But for those of us that are OCD builders.....we know what we're going to do.