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Originally Posted By: Ryan02SS
This is my experience with UOA's on my LS1. I have a 420rwhp@396rwtq H/C 02 LS1 SS. CNC heads, small TR224 cam, all supporting boltons, headers, intake TB, etc....
Rev limiter is 6800rpms and shifts for max power are at 6500rpms.
Out of 8 UOA's 15W-40 Mobil Delvac showed the best wear control compared to Mobil 1 10W-30 and Schaeffer 10W-30. IMO For a hard run performance application thicker is better. The same thinking is used in the marine world of engines. 40W and thicker is standard to keep the engine alive.
Heck, throw on a supercharger and you'll have even more justification for heavier oil
Now let's take our common GM engine that specs 5w-30 and compare it to an LSI that specs 5w-30. GM seems to think that the vast difference in power output works just fine with both engines using the same oil weight. I imagine that if GM put out an engine that had all the goodies that you've got ..putting out all the rwhp that yours does ..and could actually sell it in a federally certified manner ..make the warranty period and beyond ..it would still spec 5w-30. You're the one stretching out the output beyond the engine's capability to manage itself with the regular oil weight. I hardly call that a reason to support the heavier is better theory.
Now dry sump it ..drill out all the oil passages ..dial in the pump so that you've got the same pressure at higher volume (or whatever) ..and I say that you'll do just fine on any weight oil
This is my experience with UOA's on my LS1. I have a 420rwhp@396rwtq H/C 02 LS1 SS. CNC heads, small TR224 cam, all supporting boltons, headers, intake TB, etc....
Rev limiter is 6800rpms and shifts for max power are at 6500rpms.
Out of 8 UOA's 15W-40 Mobil Delvac showed the best wear control compared to Mobil 1 10W-30 and Schaeffer 10W-30. IMO For a hard run performance application thicker is better. The same thinking is used in the marine world of engines. 40W and thicker is standard to keep the engine alive.
Heck, throw on a supercharger and you'll have even more justification for heavier oil
Now let's take our common GM engine that specs 5w-30 and compare it to an LSI that specs 5w-30. GM seems to think that the vast difference in power output works just fine with both engines using the same oil weight. I imagine that if GM put out an engine that had all the goodies that you've got ..putting out all the rwhp that yours does ..and could actually sell it in a federally certified manner ..make the warranty period and beyond ..it would still spec 5w-30. You're the one stretching out the output beyond the engine's capability to manage itself with the regular oil weight. I hardly call that a reason to support the heavier is better theory.
Now dry sump it ..drill out all the oil passages ..dial in the pump so that you've got the same pressure at higher volume (or whatever) ..and I say that you'll do just fine on any weight oil