best oil wight for a fresh rebuild??

DriftingFC · 04-10-2008, 01:48 PM

Ya, so I got nuthin as far as the best weight to use in a fresh rebuild. Anyone got a solid knowledge (kevin Rted anyone in the know) of what to use?

RETed · 04-10-2008, 02:02 PM

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

djmtsu · 04-10-2008, 05:16 PM

I used 10w40 in my rebuild. After about a year, I switched to 20w50.

DriftingFC · 04-10-2008, 06:55 PM

Sweet. Thanks for the info guys. I prolly run a good 10-30 for break in, then switch to the 20-50 once she is nice and ready.

Boostmaniac · 04-10-2008, 07:42 PM

Quote:

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

Ender · 04-10-2008, 11:43 PM

Make sure you're using a TCW-3 two stroke oil to premix (apparently anything else will not burn clean).

This is something I'd like to know, too, because I'll be installing the Rotary Aviation OMP adapter with my rebuild.

RETed · 04-11-2008, 05:34 AM

Quote:

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

04-10-2008, 01:48 PM	#1
DriftingFC Rotary Fan in Training Join Date: Feb 2008 Location: Pittsburgh Posts: 81 Rep Power: 18	best oil wight for a fresh rebuild?? Ya, so I got nuthin as far as the best weight to use in a fresh rebuild. Anyone got a solid knowledge (kevin Rted anyone in the know) of what to use?

04-10-2008, 05:16 PM	#3
djmtsu My minds tellin' me no... Join Date: Feb 2008 Location: Murfreesboro, TN Posts: 4,043 Rep Power: 22	I used 10w40 in my rebuild. After about a year, I switched to 20w50. __________________ 1976 Mazda Cosmo RX-5 1976 Mazda Cosmo RX-5 2003 Toyota Tundra TRD 2015 Toyota 4Runner SR5

04-10-2008, 06:55 PM	#4
DriftingFC Rotary Fan in Training Join Date: Feb 2008 Location: Pittsburgh Posts: 81 Rep Power: 18	Sweet. Thanks for the info guys. I prolly run a good 10-30 for break in, then switch to the 20-50 once she is nice and ready.