Hello gang! First, thank you to everyone in this site that has helped me with reference, I have been working on my car for 19 months after I melted one piston, apparently 28psi on a stock turbo is a big no no

I will be turning on my car tomorrow and my mechanic suggested me to use Valvoline racing vr1 20-50.

Here is a list of mods

Block:
Neutral Balance Shaft
LHU pistons (slightly more compression)

Head:
Race spring/retainers zzp
Head Port/port matching for manifold

Turbo: Precision 57/57 .63ar oil cooled only

Tranny:
Final ratio 4.45
obx race lsd

Cooling:
Modern performance intercooler
Mishimoto race radiator

The car will be tuned for daily/autocross 415whp @ 18 to 20 psi, I feel uneasy chaging the type of oil used in the car. Is the oil mentioned a good move?

 

No just no.

Do not use racing oil, unless you're legitimately racing then you'll be changing oil frequently.

Go pick up some Mobile1/Valvoline 5w-30 Full Synthetic.

 

This^
20-50 oil is thick and there is no way I would run that. I would also advise you to make sure it's getting tuned by someone who knows these engines well and not by the guy who caused your piston to burn. You can run 28 psi on a stock turbo without burning the pistons. It's not going to gain you much of anything but it's doable.

 

First things first, your mechanic is a retard for saying to use 20/50 on a ecotec. 5/30 is perfect for everything it was designed for. After I built mine, and had it built with a little looser tolerances I ran 10/30.

 

Stick to 24 psi and under on stock turbo, safer and u won't gain anything hardly over that . Slap ur mech in the head for suggesting that oil. Use only full synthetic 5w30 4718 certified oil. Mobile 1 or another good brand. I use penzoil platinum and she loves it. Ask me how I know

 

Mobil one 5w 30. It's right on the filler cap

 

Just so you know, you are still running a 30 weight oil. The beginning number has nothing to do with the oils final viscosity rate; it's used to determine the oils flow point at 0 deg C.
Ie: 5w-30 oil will flow like a 5 weight oil at 0 deg C, but will thicken to a 30 weight oil at 100 deg C.
Welcome to the world of multi-viscosity oils.

 

5w or 10w 30 is much different than 20w50 though. That's what I run in my nova and its noticeably thicker than the 5-30 Mobil one I run in the cobalt.

 

No way? hense the reason to run a "10" w30 for the looser clearances at start up. Better oil pressure faster, same end result. And no longer have the cobalt, run vr1 20/50 in the vette.

 

So what, the looser tolerances magically disappear once everything is warm and has expanded? If you were to run a looser tolerance, you'd jump up at least a grade on oil, to say 5-40 or even a 50 weight. I sell oil to guys that run anywhere from 500-1000hp pulling engines that run straight 50 weight oil, one runs off methanol. But hey, I guess you know everything and I'm the smart ass on here. Smh.....

 

Do you build motors? What happens to aluminum when it gets hot? On the other side what happens to a forged crank vs cast? Aluminum swells and the forged crank grows more then cast does so the tolerances shrink when hot not needing a heavy oil in the ecotec. Just like when you bore to a bigger ptw clearance for high hp high boost applications.

 

Yeah actually I do builds motors, quite a few of them from stroker pulling motors to yzf 450r motors. Oh, and my 482awhp 4G63 boosting one of the first PTE 5756 turbos that came out in 2007 running Megasquirt V3.
I also have an associate's degree in metallurgy.
I guess you run whatever oil you want, but don't steer the OP in the wrong direction. Simply running a 10w-30 in place of a 5w oil when it's 30 or above out does absolutely nothing.
Done arguing with you here. Good day.

 

He never steered him in the wrong direction only stated on his build he ran 10w-30.

Big deal you have a associates degree in metallurgy, that means you literally are starting to scratch the surface of information. I.E. enough knowledge to be dangerous because you think you know it all but honestly have no clue.

Also glad you're wiping your dick out with the "big power" numbers on the first PTE build

 

 

Wow you guys are being real dicks here lol..

Its okay if someone has a difference of opinion, thats why were all here. To see things from different viewpoints.

Carry on

 

looks like ops questions have been answered and then people decided to start being jerks so thread closed.