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#4534953 - 10/05/17 08:53 PM Decibel Reading After Switching Oil Brands
Gebo Offline


Registered: 09/18/02
Posts: 2080
Loc: VA
I don't know how scientific this is but check this out. I have a decibel meter app on my phone. I got home, parked my LS400 in the driveway, left it idling and placed my phone directly on top of the intake. The meter bounced between 53-55 at idle.

I changed oil to a different brand and drove my LS400 about 6 miles and got it warmed up. Parked in the driveway and following the same procedure I got a reading of between 50-52 decibels.

This wasn't some emotionally guided response trying to prove one oil is better or quieter than another. Same phone, same location, same car, etc.

Looks to me that a quieter idling engine is better. Am I wrong? Seems to me the quieter oil would be better for my engine. Oh, same viscosity in that they are both 5w30's.
_________________________
'98 LEX LS400 280K
'00 LEX GS300 195K
'02 4Runner 225K
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#4534958 - 10/05/17 08:58 PM Re: Decibel Reading After Switching Oil Brands [Re: Gebo]
CKN Offline


Registered: 10/14/14
Posts: 3689
Loc: Utah
Originally Posted By: Gebo
I don't know how scientific this is but check this out. I have a decibel meter app on my phone. I got home, parked my LS400 in the driveway, left it idling and placed my phone directly on top of the intake. The meter bounced between 53-55 at idle.

I changed oil to a different brand and drove my LS400 about 6 miles and got it warmed up. Parked in the driveway and following the same procedure I got a reading of between 50-52 decibels.

This wasn't some emotionally guided response trying to prove one oil is better or quieter than another. Same phone, same location, same car, etc.

Looks to me that a quieter idling engine is better. Am I wrong? Seems to me the quieter oil would be better for my engine. Oh, same viscosity in that they are both 5w30's.


Those differences are so small you can't draw any conclusions from them-IMHO. Your phone (the app aside) is not a scientific sound measuring device.

Useless thread.....


Edited by CKN (10/05/17 09:00 PM)

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#4534962 - 10/05/17 09:03 PM Re: Decibel Reading After Switching Oil Brands [Re: Gebo]
Urshurak776 Offline


Registered: 08/21/12
Posts: 445
Loc: North Carolina
Was your neighbor mowing the lawn the first time?
_________________________
2012 Hyundai Santa Fe, 125,000 miles, Supertech Full Syn high mileage 5W-30, Auto7 Filter.
2014 Kia Rio, 80,000 miles, Havoline Pro DS Syn 5W-30, WIX Filter

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#4534963 - 10/05/17 09:03 PM Re: Decibel Reading After Switching Oil Brands [Re: Gebo]
Urshurak776 Offline


Registered: 08/21/12
Posts: 445
Loc: North Carolina
Joking of course......but
_________________________
2012 Hyundai Santa Fe, 125,000 miles, Supertech Full Syn high mileage 5W-30, Auto7 Filter.
2014 Kia Rio, 80,000 miles, Havoline Pro DS Syn 5W-30, WIX Filter

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#4534970 - 10/05/17 09:09 PM Re: Decibel Reading After Switching Oil Brands [Re: Gebo]
CharlieW618 Offline


Registered: 02/17/13
Posts: 76
Loc: Herrin, Illinois
Fresh oil vs. used oil probably accounts for the difference. shrug
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#4534971 - 10/05/17 09:10 PM Re: Decibel Reading After Switching Oil Brands [Re: Gebo]
PimTac Offline


Registered: 03/04/17
Posts: 4258
Loc: Soviet State of Washington
Perhaps not a scientific device but if the same device is used throughout and conditions are the same for each reading, it would give us a general idea or a trend would it not?
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#4535018 - 10/05/17 10:09 PM Re: Decibel Reading After Switching Oil Brands [Re: PimTac]
Gebo Offline


Registered: 09/18/02
Posts: 2080
Loc: VA
Originally Posted By: PimTac
Perhaps not a scientific device but if the same device is used throughout and conditions are the same for each reading, it would give us a general idea or a trend would it not?


Sort of my thinking.
_________________________
'98 LEX LS400 280K
'00 LEX GS300 195K
'02 4Runner 225K
'05 Lex LS430 85K
'06 Toyota Highlander 145K
'09 Lex IS350 85K


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#4535027 - 10/05/17 10:18 PM Re: Decibel Reading After Switching Oil Brands [Re: Gebo]
SirTanon Offline


Registered: 06/23/14
Posts: 2152
Loc: Phoenix, Arizona - USA
If you had breathed on it while it was running, you would have raised the decibel level from 50 to 53.. if not more.

Moderate rainfall is 50dB, and normal human conversation is 55dB. Leaves rustling/calm breathing is 15dB.

Personally, I would consider a change from 50-52 to 53-55 (or vice-versa) just statistical noise.


_________________________
2010 Ford Fusion SE - 2.5 liter/6F35 Trans - 257,000mi
2014 Nissan Altima SL - 2.5 liter/CVT - 55,000mi

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#4535030 - 10/05/17 10:26 PM Re: Decibel Reading After Switching Oil Brands [Re: Gebo]
robertcope Offline


Registered: 01/10/08
Posts: 1001
Loc: TX
I love that you are trying to be scientific about this!

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#4535039 - 10/05/17 10:49 PM Re: Decibel Reading After Switching Oil Brands [Re: Gebo]
zeng Offline


Registered: 09/01/15
Posts: 2188
Loc: Malaysia
Originally Posted By: Gebo
Originally Posted By: PimTac
Perhaps not a scientific device but if the same device is used throughout and conditions are the same for each reading, it would give us a general idea or a trend would it not?


Sort of my thinking.

+1

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#4535056 - 10/06/17 12:05 AM Re: Decibel Reading After Switching Oil Brands [Re: CharlieW618]
raytseng Offline


Registered: 12/11/08
Posts: 2333
Loc: CA
Originally Posted By: CharlieW618
Fresh oil vs. used oil probably accounts for the difference. shrug

i believe this hypothesis.
When oil is put into service it is different than after it's been heated cycled a few times.
Try your reading again in a week, and every week and track the results through the next oil change.

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#4535059 - 10/06/17 12:09 AM Re: Decibel Reading After Switching Oil Brands [Re: raytseng]
PimTac Offline


Registered: 03/04/17
Posts: 4258
Loc: Soviet State of Washington
Originally Posted By: raytseng
Originally Posted By: CharlieW618
Fresh oil vs. used oil probably accounts for the difference. shrug

i believe this hypothesis.
When oil is put into service it is different than after it's been heated cycled a few times.
Try your reading again in a week, and every week and track the results through the next oil change.





This idea has merit.
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2017 Mazda CX-5 Grand Touring

Valvoline Advanced Synthetic 0w20
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#4535065 - 10/06/17 12:20 AM Re: Decibel Reading After Switching Oil Brands [Re: Gebo]
danielLD Offline


Registered: 08/12/17
Posts: 226
Loc: Chicago
The idea is 110% valid. Fluid dynamics or acoustic theory is literally what you are describing.

However, the idea that an engine oil that has a quieter acoustic property creates less wear has never been proven. In many cases the oil with a poorer acoustic property was shown to have better wear properties. Meaning the acoustic property is not reflective of the wear properties.

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#4535079 - 10/06/17 01:16 AM Re: Decibel Reading After Switching Oil Brands [Re: Gebo]
oldhp Offline


Registered: 06/28/12
Posts: 1622
Loc: USA
Go out on a limb.............put 5W20 in it, then take a reading. grin
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#4535080 - 10/06/17 01:20 AM Re: Decibel Reading After Switching Oil Brands [Re: SirTanon]
Shannow Online   content


Registered: 12/12/02
Posts: 39853
Loc: 'Stralia
Originally Posted By: SirTanon
If you had breathed on it while it was running, you would have raised the decibel level from 50 to 53.. if not more.

Moderate rainfall is 50dB, and normal human conversation is 55dB. Leaves rustling/calm breathing is 15dB.

Personally, I would consider a change from 50-52 to 53-55 (or vice-versa) just statistical noise.




No you wouldn't dB is a logarithmic scale.

going from 3dB to 6dB is doubling the sound Pressure...6dB to 9dB is double again, i.e. 4 times the sound pressure.

Breathing on a 3dB source makes a huge difference, breathing on a 50dB source is nothing...approximately 1 part in 4,000 in terms of sound pressure, 52dB becomes 52.01 if you get the drift.

As to the OP's issue, here's some actual testing from a paper I found ages ago...

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