Break in oil for 2005 LS2

[Sweebation]

Hello, I recently rebuilt my 2005 corvette’s LS2. I’m about ready to start it but I want to be 100% certain what I’m giving my car will be the best for it. I have already put 6 quarts of Joe Gibbs (Driven) 5w-30 break in oil and after the initial start and vacuum pulls I was planning to put in 6 quarts of dino STP 5w-30 from autozone with a rislone zinc supplement as this is all I could find nearby to me. Will this second option potentially be harmful? I have seen mixed opinion online in the rare occasion I see this topic being discussed, on one hand there are people saying conventional with ZDDP additives are interchangeable with specialty break in oil And just as many people it’s a stupid idea to use normal oil (I haven’t seen comments about the additives however). There are also people recommended to use 5w-40 or even straight weights too. In addition, If I am good to use Dino oil with an additive is there one ZDDP additive I should use over others? I would appreciate some guidance on this topic greatly. Thank you in advance!

 

[Lrobby99]

Quite a complex question. I would call up a big Chevy dealer and ask their advice.

 

[kschachn]

Post some pictures of this beast.

 

[joekingcorvette]

I would go by what is on the fill cap. Mobil 1 full synthetic and if I remember correctly it's a 10W30. I owned a brand new 2005 Corvette and drove it up to 82,000 miles and sold it last summer to buy a C7. I had great luck with the Mobil 1 synthetic. My 2005 Corvette didn't burn any oil between changes and I changed it at least once every year and many times twice.

 

[JavierH19]

For off the shelf oils to use in something like that I'd get castrol edge euro 5w-30. I wouldn't bother with any additives.

Castrol EDGE Euro Car 5W30 A3/B4 VOA

From what I can tell from the 5qt jug date code, this oil was produced in 2022. Picked it up from Walmart and it's going in our 2013 Volvo S80. I'm liking it. API rating is SL, but keep in mind it IS an ACEA A3/B4 oil. It is also in the VOA Database. FYI, highest 5W30 TBN in the database...

bobistheoilguy.com

 

[Sweebation]

Quite a complex question. I would call up a big Chevy dealer and ask their advice.

That is probably what I will do thank you!

 

[Sweebation]

Post some pictures of this beast.

 

[thastinger]

Did you build the bottom end? I would ask the builder what they recommend for break-in oil/mileage etc.
You seem to already have the break-in oil, so the procedure you use to load & unload the rings is all you need to decide.

 

[kschachn]

View attachment 206754View attachment 206755View attachment 206757View attachment 206756

Nice thank you. Engine pictures are the best.

 

[wpod]

Run the oil that you are going to use in the engine. Just drive the car how you are going to drive it. No voodoo is needed.

 

[BrendanC]

run the break in oil for your initial heat cycles and drives then drain it. if you kept stock clearances, my recomendations are in order. any HPL 5w-30 or 5w-40, Valvoline EP HM 5w-30, any Euro 5w-30/40, or PUP.

In all reality, you spent a lot of money getting your LS2 back to like new condition and your best option is a boutique like HPL to keep it healthy for a long time.
even their PCMO 5w-30/40 lines will be plenty of protection, but you can go up from there.

 

[Patman]

My recommendation would be the same oil I'm running in my C7, which is Mobil 1 ESP 5w30. This oil is a little bit more stout than the normal Mobil 1 5w30, it's formulated on the thicker end of the 30wt range and has a stronger HTHS of 3.5, compared to 3.1 for the regular M1 5w30. That way when the oil temperatures are hotter and you're driving it hard, it will protect the engine better.

 

[joekingcorvette]

Nice looking C6. Those LS engines are awesome too.

 

[nascarnation]

With a roller cam, I don't think the zinc has much relevance. These came out of the production plant with Mobil 1, nothing special.

 

[someonesomewhere]

With a roller cam, I don't think the zinc has much relevance. These came out of the production plant with Mobil 1, nothing special.

If the lifters are roller, and the rocker arms are roller, you are correct. Zinc only really matters for flat tappet cams and lifters. Think old school SBC/SBF cam and lifter setups.

 

[nascarnation]

If the lifters are roller, and the rocker arms are roller, you are correct. Zinc only really matters for flat tappet cams and lifters. Think old school SBC/SBF cam and lifter setups.

My 25 yr old S10 4.3 V6 has a roller cam and roller rockers so this config has been around a while in GMs.