Oil + additive viscosity

fjr said

Don't use Lucas Oil Stabiliser. It dilutes the additives in your engine oil because it has very little of its own and can cause air entrainment. If you need more viscosity, use a heavier engine instead. See Lucas Oil Stabilizer.

Engines need oil flow and pressure is a characteristic of flow and viscosity. Excessively thick oil will just be relieved back to the sump without getting to the bearings. See Engine Wear.

What is the reason that you think you need a higher viscosity?

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The reason for a thicker viscosity is that the valve train is slightly quieter with say 20w60 as apposed to 15w40 oil. I am running an extreme energy cam with sharp rise and fall lobes and the valve train does sound a little like a solid cam profile. But I must admit the engine does feel more lively with the thinner 15w40 oil. It revs and responds better. My question is that just because the rocker gear sounds a little noisier does this mean there is potentially more stress and wear on the valve train?
Regards
Billy D...