yeah that shell 20W50 **** is what helped screw mine up, maybe the 5W30 would work for an LS7 but I’ll pass on it all together, zinc content......not going down that road. I’ll be using Amsoil and mobile one 5W30 only.

Driven LS 30 scored high in wear protection when the test were done on 250 different oils. That’s where I made my decisions on oil. It’s a good read, it’s on this forum if you search for it, lots of hard facts no bullshit marketing ploys. What I found Interesting is that shell rotella with all this amazing zinc didn’t even make top 250!

I wasn’t trying to suggest you read or don’t read anything honestly. Just throwing out there that it’s a good read and great source of information with test data only and that’s how I came to my decision on what oil I’d run. I was also just stating factual data that these test showed Gibbs LS 30 did very well, so did a lot of other brands. My engine builder likes and uses non synthetic for short period break in. You can go down that rabbit hole if you’ve got time to kill, you’ll find opinions from very credible camps that go both ways, synthetic doesn’t let piston rings set properly....or it doesn’t matter conventional or synthetic, parts intended to wear will wear regardless. I too will go with what gives my builder warm and fuzzies.