Many people on this board, as well as other forums, reported smoother idle when switching to high-moly oils (Redline for example), or when adding MOS2 or other Moly heavy additive to their current fill. So I guess moly does do some "smoothening" to the normal idle vibrations.Probably the same but how would moly have a effect on engine idle?
Many people on this board, as well as other forums, reported smoother idle when switching to high-moly oils (Redline for example), or when adding MOS2 or other Moly heavy additive to their current fill. So I guess moly does do some "smoothening" to the normal idle vibrations.
interesting since some on this site say M1 is noisy.
I assume you didn't change the filter the second time since it was only a week old. Just to eliminate oil filter issues.
some possibilities:
Did your wife get gas around the same times you changed the oil?
maybe additional noise with Kirkland was perceived as rough idle.
very rare but bad oil. They forgot to add moly (or the equivalent) like soda machine with no carbonation ...
maybe the new oil (kirkland) was having a longer than normal tribofilm war with the previous oil.
did you touch any wiring?
sounds like something intermittent or bad gas and not oil related.
Sound, smell, color, feel, taste...all variables that are not truly quantifiable with the human senses with engine oil...but people swear there are differences. There are reasons we use sophisticated measurement devices in research and not just our five senses! These people who swear they can detect any differences sound just plain silly.More likely that someone was poking the rough idle voodoo doll than any of those
Did you know you used Kirkland oil? What did YOU think of the idle?
Correct, unless there is a difference in viscosities. My wife’s Accord idled significantly smoother (with less NVH) when it was filled with Valvoline Premium Blue Restore (which was almost a 40wt) compared to the current fill of ST 5W20.Oil choice does not affect idle smoothness. Bottom line.
I think the subaru gets a little nosier at idle at the end of an OCI. I guess I could record it idling before and after a change with the phone and find some audio analysis tools but I don't care that much...Correct, unless there is a difference in viscosities. My wife’s Accord idled significantly smoother (with less NVH) when it was filled with Valvoline Premium Blue Restore (which was almost a 40wt) compared to the current fill of ST 5W20.
Measurement tools says there is a sound difference.Sound, smell, color, feel, taste...all variables that are not truly quantifiable with the human senses with engine oil...but people swear there are differences. There are reasons we use sophisticated measurement devices in research and not just our five senses! These people who swear they can detect any differences sound just plain silly.
What the hell is a Mitsubishi?
What the hell is a Mitsubishi?
Eh...what they says is oil does contribute to noise reduction and that a special debugging oil decreased noise. What it doesn’t say is there is any difference with commercially available oils - especially within a specific grade. Interesting enough oil A and B were essentially the same. Next part of this research would be to determine what is the minimal decibel level difference that the human ear can detect. This paper may say something about oil and noise level but it does not support the idea 0W20 ST is noisier than Mobil 1.Measurement tools says there is a sound difference.
Study on Engine Noise Level vs Oil Formulation
Thought this was somewhat interesting, especially the engine noise level vs oil formulation used data. We've all seen various threads where people say they can hear an engine noise level difference with different oils, and some say it's "all in their head" or "their ears aren't sensitive enough...bobistheoilguy.com