I've got LS7 lifters in my camed LS1 which has about 125k m
Km on the engine
The engine was noisy with 5w30, still a bit little noisy with 10w40, now, using 10w60 the engine runs nice and quite
Engine runs like a dream with no drawbacks at all
My choice for running a thicker oil in the LS was from doing "alot" of research, taking the climate into consideration, and, most importantly, just experimenting with different brands and weights
Engine oils I've tried in this engine, all full synth: (I did and engine oil flush when I first picked up the car with 115k km on it).
Nulon 5w30 - noisy - changed after 2000km
Penrite 5w30 - noisy - changed after 2000km
Penrite 10w40 - better - changed after 5000km
Carstrol Edge 10w60 - best-currently has 1000km of use and will get changed at 5000km
I'll get a oil test done now that my ears are happy when I swap out the oil
And as the oiling system in the top of the LS is a "splash around and hope it lands in the right place" for me the thicher oil is a bonus for cooling and lubrication
I was going to try Penrite 10w50 but the Castrol Edge was on special
Disclaimer: my research and choices are based of the sound of the engine and what other people have recommended, BUT, the only way to REALLY tell how your oil is performing is an oil test
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On a side note, my Harley also uses 10w60
On a another side note: about the price of oil, it costs me approximately $100 to do an oil/filter change, I consider this "cheap insurance" for an engine that could cost around $10k to replace
On another another side note: the car user manual recommends the oil that will typically give the best fuel economy and engine protection for a car that is driven by Miss Daisy.......personal opinion.....
This post represents the official views of the voices in my head
Opions will most definitely vary, whether it is based of testing, research or what the cool kids are doing