Jetdriver69

I have read that no synthetic oil should be used for 7000 miles after a rebuild. Is this necessary?

The procedure I read is straight 30 wt non detergent oil for the first 30 minute run to seat the rings, then change the oil/filter with a high zinc oil such as Shell or Valvoline 20W/50 organic and/or add a zinc additive.

Drive for 500 to 1000 miles at various speeds, then change to a high quality conventional oil.

Is there a need to keep using conventional oil after the first 500 or 1000 miles? Where did 7000 miles come from as I want to use a synthetic after the break in period. Thanks.

WallyP

Old, old info. Every new car that uses synthetic gets a standard oil fill on the assembly line. Many folks do like to make the first change early. You won't hurt anything by using a high-quality non-synthetic for the first 500 miles if you are really ****. I would not put 30-wt non-detergent in my engine. You can ruin the cam noses very quickly.

Since this is a question of religion, not knowledge, I'm sure that you will get several opinions...

BC

There is a break in oil made by someone with very high levels of ZDDP - thats what some suggest.

RKD in OKC

Royal Purple has an oil that is specifically break in oil. The motors I've rebuilt I just put whatever I was going to run and did the first change at 500 to catch any debris. Never had a problem.

Jetdriver69

OK the break in info was from 928 Motorsports.

So should I use 20W/50 conventional with a zinc additive for the break in and then I can use a synthetic like Royal Purple or Mobil 1 15W/50 after?

I read that using synthetic in the break in will glaze the cylinder walls, is this a problem?

Does everyone dump the oil after the first ring seating to get rid of any metal particles and assembly lube, then change the oil again after 500 miles?

Thanks

ROG100

That is on their engines - normal engine builds do not need that 8>) If you believe what you hear they are lucky to make 90 miles not 7000.

Greg Brown would probably use Torco (spelling) break in oil for his strokers. Hopefully he will chime in.

SeanR

I think I just figured out what car this is.................why the hell did you have that engine rebuilt?

Jherriott

Is Greg Brown the same guy that did flow-bench testing way back in the VW GTI days at Autotech Sport Tuning?

SeanR

Kinda doubt it since he was doing Porsche racing engines.

ROG100

Jason - Greg Brown is the only person I would trust to build my stroker engine - I do not think he worked on GTI's

GregBBRD

Yup. Jim Sly asked me to do it, so I did.

Jherriott

Ah okay.

But please Gentlemen, don't take that comment of mine as a slight. I hold *anyone* in high regard that spends countless hours on a flow bench! It is an art form. And whether they hone that combination of science and artistry on a Volkswagen head or a Porsche head is of insignificance in my eyes... please no offense.

GregBBRD

Pour Torco TR-1 20/50 into it.

Change the oil filter after the initial "run in" (30 minutes)....especially important if you used any moly to assemble any part of the engine.

Change the oil and the filter after the first 1,000 miles.....with the same stuff.

Jherriott

You mean *THE* James Sly from Techtonics Tuning?

GregBBRD

Yes. Mind numbing is an understatement.

As I recall, I ground a couple of heads into scrap metal, before I figured out what worked.