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L20b 86mm pistons


Kingcab

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Oil anything with the high zinc... guys here like the rottella I believe.... I actually went the royal purple route they offer a HPS high zinc and phosphorus oil..

 

As far as break in the rings hasn't it already been running?

Basically now just drive it....

I actually broke my motor in on a dyno and all we did was a couple pulls to 2000, let the motor compression settle it back to idle then go again with a bit more rpm, but I was also breaking in a cam and stuff too.... once done I was making pulls to about 5500 ....

If your running and driving just go for a cruise vary the rpm and let the motor compression slow the vehicle and you'll be fine....

I'm sure I'll be corrected if someone disagrees...

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DRIVE it. Keep eye on temp and water/oil levels. Don't let it idle for long periods or maintain the same speeds and vary the acceleration and load on it. Make it do some work. Acceleration under load forces the rings against the cylinder walls and this wears them together and improves the seal that holds the compression in. 

 

A 'break in' oil just causes accelerated wear to speed up the process, but I would never use it. Easier to just drive it. Yes use a high content ZDDP oil like 15w40 Chevron Delo 400 or Shell Rotella T4 or any marked racing oil. I'm not a fan of synthetic oils they are over priced and their protection more than you need.

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I dont blame you for being cautious... last thing you wanna do is undo everything you just accomplished..

People will always have varying opinions on this...

But I was told by royal purple that I could leave their break in fluid in till 1000 to 1500 miles, i have already changed the oil filter once just after initial break in just to make sure all was good. Good idea to open the filter up and look for excessive metal after, lucky for me all was good there too... i plan on changing the filter again at 500 but leaving the break in oil in, and at 1000 miles I will do a full oil change ... so i probably wouldn't use the break in oil till 4000.... 500 or a 1000 should be fine.

The biggest thing is make sure use a break in oil with high zinc and phosphorus.. if you cant get that just go with the rottella like mike said..

Also use a quality filter like bosch or wix... fram sucks, stp is questionable...

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If you change on time and have a good running unmodified car fram will work, but for the price there are much better quality out there for piece of mind.

This is what i told people during my years in auto parts. If you're really good at maintenance, the basic crap is likely fine. But if you are a ANYTHING but perfect about maintenance, just get a WIX.

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