indirect amsoil question
https://ls1tech.com/forums/generation-iii-internal-engine/401068-simple-oil-question-here.html
Anyhow, from my own observations and the observations of other people who use Amsoil, it does tend to quiet down some of the valvetrain noise. I have a cam with high ramp rates, and I did notice a reduction in noise over the previous oil I was using, which was Mobil 1 0w40. Not only that, but Amsoil has one of the best additive packages I've seen... I think only Redline compares, but Redline is a little more expensive.
That said, I don't think you can go wrong using Amsoil, Redline, or from the mass market, Mobil 1 (but in the 0w40, the 5w30 seems to thin out too much for high stress applications in LS1s). German Castrol is good too, but you can't find it around here.
I'll let some of those around here who have purchased the oil speak up about their observations, since I know mine probably will be seen as biased.
I was running Moblile 1 in the Euro Formula, 0w40. Great stuff. I switched to the Amsoil Euro in 5w40 and love it. My oil pressure is a few points over what it was. It used to dip a bit below 40psi at idle in gear hot. After I switched it has stayed a shade above the 40 mark, hot, in rushour.
Jason gives us a great cost on it. Plus, it arrives at your doorstep a couple days after ordering.

