best oil wight for a fresh rebuild??

[RETed]

Mazda recommends SAE30 (straight 30 weight), but use anything BUT synths...
10W30 or 20W50 is okay.

Do not use synths cause they are too "slippery".
You need a little bit of friction to allow seals to bed in nicely.
Synths work too well, and don't allow the engine to do this properly.

We'll leave the whole synth oil debate for a later thread... :P


-Ted

[Boostmaniac]

Originally Posted by RETed

Mazda recommends SAE30 (straight 30 weight), but use anything BUT synths...
10W30 or 20W50 is okay.

Do not use synths cause they are too "slippery".
You need a little bit of friction to allow seals to bed in nicely.
Synths work too well, and don't allow the engine to do this properly.

We'll leave the whole synth oil debate for a later thread... :P


-Ted

Hey Ted, will the synth even matter if the OMP is removed? (he didn't say he removed the OMP I know). Doesn't even seem like it would matter in that case though unless maybe there were new bearings involved.

And since I am on this track anyways. If you were running straight premix, is there any premix to avoid during break in?

-Maniac

[RETed]

Originally Posted by Boostmaniac

Hey Ted, will the synth even matter if the OMP is removed? (he didn't say he removed the OMP I know). Doesn't even seem like it would matter in that case though unless maybe there were new bearings involved.

And since I am on this track anyways. If you were running straight premix, is there any premix to avoid during break in?

You should really start your own thread on this, since it's going to get involved...

I would still recommend NO synth on break-in, OMP in effect or not.
We're talking about the other seals like side seals, oil control rings, and even the corner seals and apex seals.
Oil is still distributed on the side housings, so all those seals are affected.

Premix should always be used, period.


-Ted