Fresh Oil = Quiet

[GR_CoB]

Was that the first oil change on that Vibe?

Idk. I purchased it at 90k. As I found after purchasing it - it was an ex-fleet vehicle.
It had a slight puff out of the tailpipe after sitting. Then I gave it lots of high mileage oil and Marvel Mystery Oil. It decreased the oil consumption greatly, eliminated the lifter tap, but unfortunately didn't do much for the heavy sludge. I sold that car soon after it hit 100k miles, as it started having other issues.

 

[camrydriver111]

Sound/vibration data needed. You do 5K changes with HPL on a 14 yo NA Accord with 270K miles? Why?

Oil is cheap, engines are expensive.

Even running HPL at 5k OCI is cheap insurance.

He's also going DOUBLE the OCI that top engine builders recommend. 2k or 3k, depending on who you ask.

 

[TiGeo]

Oil is cheap, engines are expensive.

Even running HPL at 5k OCI is cheap insurance.

He's also going DOUBLE the OCI that top engine builders recommend. 2k or 3k, depending on who you ask.

So why not 3K then?

 

[Nesterenko]

Even running HPL at 5k OCI is cheap insurance

Please stop with that cheap insurance nonsense.

 

[H. Swanson]

The 3.5L Tacoma, I went from year old SS 0W-30 to Euro 0W-30 (4qts) and 1 qt 10W-30 small engine oil and the difference was astounding. The engine is a loud ticky thing normally. Now just butter smooth.

Do you think it was new oil that made the difference or switching to Euro? I'm on SS but thought about switching to Euro to try it out.

 

[wpod]

Why is it that a fresh oil change in my Honda always results in a buttery quiet engine and as the miles rack up (in only do 5k mile OCI's) the engine gets noisier and noisier? Mostly ticking.

I'm running 5w40 HPL SuperCar in my 2010 Honda Accord with 270k miles

5,000 miles with HPL oil?

 

[Pablo]

Do you think it was new oil that made the difference or switching to Euro? I'm on SS but thought about switching to Euro to try it out.

Probably Euro.

 

[Triple_Se7en]

Do you think it was new oil that made the difference or switching to Euro? I'm on SS but thought about switching to Euro to try it out.

I'm on Amsoil Euro 0w30 and thinking about changing to SS 5W30.
We are surely living in a upside down world.

 

[cryptolyme]

new oil is always quieter. been my experience in every vehicle i've ever owned. except mobil 1. it's louder than other oils even with a fresh fill.

 

[SR5]

Some previous threads have linked to research papers where dB measurements are taken with different engine oils being used in the same engine, under controlled conditions. They show the effect doesn't always happen, but when it does the sound effect is real and measurable and perceivable to humans.

https://bobistheoilguy.com/forums/t...level-vs-oil-formulation.337707/#post-5678955

https://bobistheoilguy.com/forums/t...ter-switching-oil-brands.277303/#post-4535107

Research Paper (pdf) https://iopscience.iop.org/article/10.1088/1757-899X/493/1/012008/pdf

Table below from another paper showing sound level dB measurements as the oil ages. I bet the driver of the car that went from 82 dB to 71 dB after one week would definitely hear a difference. But in other cars, there was no change in noise levels. But the effect is real in some cars.

 

[BigJohn]

I'll agree with the OP... fresh oil is always super quiet and smooth.... It is such a wow factor with me, that it makes me want to change my oil every 1,000 miles.... hahahhaha.....

xxxxx

 

[thunderous1335]

This is no placebo. It's real. I just wanted to make sure I wasn't losing my mind.

2.4L engine. Valves are good. I just put a new exhaust cam in it.

5w40 is too thick for that engine

 

[4WD]

new oil is always quieter. been my experience in every vehicle i've ever owned. except mobil 1. it's louder than other oils even with a fresh fill.

but those of us who tested with a dB meter found PUP to be louder than M1 right away ... and considering how many formulas that M1 makes - how many they supply base stock for - how many with same additive packs ... Uh ... Maybe we should move to smoothness or slug of --- or one of the other many exact sciences found here ...
Oh, and some have the driver seat dyno down pat ...

 

[cryptolyme]

but those of us who tested with a dB meter found PUP to be louder than M1 right away ... and considering how many formulas that M1 makes - how many they supply base stock for - how many with same additive packs ... Uh ... Maybe we should move to smoothness or slug of --- or one of the other many exact sciences found here ...
Oh, and some have the driver seat dyno down pat ...

could be. never used PUP.

 

[mr_boring]

Everyone is walking around with a powerful tool to answer this question but nobody will take a few minutes to do it. Vibration and noise analyzer apps on their phone. Simple variable control e.g. do it in the garage before and after the change, keep the phone in the same place on/in the engine compartment.

May I see your powerful tool before a bear eats it?

 

[mr_boring]

Yup, that's the only way. Gotta repeat it monthly to verify that Earths rotation and Moon distance are accounted for.

That Coriolis effect is sumpin'

I read in a book and then I saw it in a movie that a sniper has to take it into account to hit the president from a mile away. I seen it with my own two eyes. Gospel according to Bob Lee Swagger yo.

Bob Lee was from Blue Eye Arkansas - which was about 150 miles from Mena AR (which is where I grew up), which is infamous for operations of Barry Seal. See, it all makes sense now. Praise be to Bob Lee.

 

[BLND1]

Some previous threads have linked to research papers where dB measurements are taken with different engine oils being used in the same engine, under controlled conditions. They show the effect doesn't always happen, but when it does the sound effect is real and measurable and perceivable to humans.

https://bobistheoilguy.com/forums/t...level-vs-oil-formulation.337707/#post-5678955

https://bobistheoilguy.com/forums/t...ter-switching-oil-brands.277303/#post-4535107

Research Paper (pdf) https://iopscience.iop.org/article/10.1088/1757-899X/493/1/012008/pdf

Table below from another paper showing sound level dB measurements as the oil ages. I bet the driver of the car that went from 82 dB to 71 dB after one week would definitely hear a difference. But in other cars, there was no change in noise levels. But the effect is real in some cars.

View attachment 219126

If I recall that Chinese paper only found statistically significant changes when moving several grades up or down - not within grade. And even then, the changes were less than the level at which humans could differentiate.

As for that table - lol… anyone using that in 2024 should be embarrassed.

Can’t discuss science with true believers though.