Smoother, quieter after oil change

[fdcg27]

I almost always notice that any engine is smoother just after an oil change.
Don't really know why, but it seems typical and on a car that you use regularly, it's pretty easy to detect.

 

[NO2]

It's always quieter for me too, perhaps because the sump is full after the oil change instead of 1/2 - 1 qt down and the oil isn't thinned from fuel and shearing

 

[KitaCam]

I notice the same improvement when I add a half-quart...

 

[Merkava_4]

Smoother a quieter because the oil you drained out is probably all sheared down to nothing.

 

[Warstud]

It was noticable on my dads Camaro...the difference was night and day. Either he rarely changed the oil or it was always low idk. A few years back... Castrol had an oil called "Start Up" after using it I noticed the engine ran so much smoother than any other oil I've ever used.

 

[Benzadmiral]

Originally Posted By: L_Sludger
I've noticed it too. I've also noticed the opposite. Depends on the car, the oil, et cetera.

PS: In Russia they'd call it a Spasibo effect!

"In Soviet Russia oil changes YOU!"

 

[andyd]

I noticed the difference on the daughter's Corolla after an 11k OCI. Two weeks later, the car was much quieter when she visited. Noticeably quiet,like after a successful valve adjustment quiet. So the silver jug of Valvoline 5w30 synthetic starts out thick and shears over time. No hard data just an old motor head's deaf ears

 

[Reggaemon]

I think it depends on the oil. On my Hyundai 2.4 I always used Hyundai filters and any 5w20 that was on sale. I never noticed any difference...then one morning driving to work I thought ,gee the engine seems guieter today. It was then I remembered that I had done an oil change the night before and used Quaker State Conventional. Yes I guess I'm that forgetful. I have no doubt that Quaker State Conventional run quiet in that engine. Did it stay quieter? Who knows.