Noise vs wear?

[Lex94]

Originally Posted By: virginoil
Noisy engine sounds like a reason to buy a new vehicle.

That is why companies are requiring 0w20...When the engine sounds like a blender full of BBs at 80K miles, you will trade it in for new

 

[riggaz]

Originally Posted By: yvon_la
liker I said ,some oil are making engine noisier but are better for the engine ,other oil are more silent making the engine yet when you look at blackstone analysis the wear is so high its insane.there is no way aside form getting a db level.ya kind of hard hence why most rely on blackstone


I wouldn't use used oil analysis as a wear indicator, it's not what they are designed for.

 

[Leonardo629]

I call this noise business bulls*it..how can noise change if there's no metal to metal contact provided you use the same weight of oil?

My V8 make the same noise whether I'm using 10W60 or 0W40, and it has plenty of parts inside to make noise.

The M3 actually sounds quieter than my Accord with DI at idle speed.

 

[riggaz]

Good for you, but I and others have personally experienced a change in noise and the smoothness of an engine with different oils. It will be an engine specific thing so just because you haven't experienced it, doesn't mean it isn't happening.

 

[Lex94]

Cognitive ability and sensory keenness have a lot to do with it as well.

 

[gregoron]

I don't think that noise and wear are related. I do think that engines and drive trains resonate and emit harmonic "noise", or what we call minute vibration.

Some oil do a better job at minimizing or damping that vibration at different engine speeds or RPMs. It can dampen it at lower RPMs where most people run their engine in than at higher RPMs, where the automatic transmission will least likely stray for reasons of fuel economy. Then, there are other oils that dampen noise at higher RPMs than lower ones. I don't think tribilogists do this on purpose when they formulate oil, but it's just the characteristic of the oil.

I'm just theorizing this based on the changed harmonics of my car when I changed out my passenger side CV axle from the OEM hollow tube to an after-marker solid shaft. My car started to vibrate at 3800 to 4500 RPM. After much research online, others who had the same problem pointed out the new CV axle. After they switched back to the OEM ones, the vibration went away.

This makes me think that engines and drive trains do create harmonic noise and anything you put into it like engine oil will affect it. Just a theory.