what kind of lifters, hyd roller or FT? i use it in my older craftsman lawn mower & it definitely quiets the slight bearing noise & stops or slows some oil burning on cold start ups. i have used some in a FT cam 400 engine when i had some extra, didnt notice any difference in lifter sound, which is not really an issue to begin with.
for hyd roller noise, many manufacturers & engine builders suggest a thinner oil like 10/30, using thicker oil or adding super thick additives like STP or lucas probably wont help the issue, but im sure each situation is different, give it a try if you have noisy lifters.
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