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I have a rattle at start up and I except it as a byproduct of having hydraulic lifters and an an engine that is positioned close to the ground in a configuration the puts the lifters very close to the sheet metal at its mid section without much in the way of sound deadening material.
Valve train noise on start-up is a fact of life with hydraulic lifters. If your engine gets quieter on start up after going to a higher viscosity oil it’s not likely due to superior lubrication, is due to the fact that the higher viscosity oil is less likely to flow out of the lifters after shutdown. Higher viscosity might mean reduced noise at start-up, but that would likely coincide with reduced flow (note, flow is related to, but not the same as pressure) at start-up. It might be good for your ears, but not so much for your engine. I run 0-30 in OAT that range from 30-95df. 0-30 flows better than 0-40 when cold…and both flow better than 5W-30/40. Those of you who run 10W-XX in your Porsches likely do not understand why, just that it “sounds” better. Unless you’re in Dubai in summertime, I can think of no reason to run any oil above 0W-30 on a relatively low mileage water cooled Porsche street car. At operating temp, 10psi per 1000rpm will give the ideal flow, the lowest viscosity multigrade that will yield those results will be best to minimize cold start wear…
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