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Decibel Reading After Switching Oil Brands #4534953
10/05/17 08:53 PM
10/05/17 08:53 PM
Joined: Sep 2002
Posts: 2,257
VA
Gebo Offline OP
Gebo  Offline OP
Joined: Sep 2002
Posts: 2,257
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
'05 Lex LS430 85K
'06 Toyota Highlander 145K
'09 Lex IS350 85K
'07 Lex GX470 58K

Re: Decibel Reading After Switching Oil Brands [Re: Gebo] #4534958
10/05/17 08:58 PM
10/05/17 08:58 PM
Joined: Oct 2014
Posts: 3,893
Utah
CKN Online content
CKN  Online Content
Joined: Oct 2014
Posts: 3,893
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.....

Last edited by CKN; 10/05/17 09:00 PM.
Re: Decibel Reading After Switching Oil Brands [Re: Gebo] #4534962
10/05/17 09:03 PM
10/05/17 09:03 PM
Joined: Aug 2012
Posts: 447
North Carolina
Urshurak776 Offline
Urshurak776  Offline
Joined: Aug 2012
Posts: 447
North Carolina
Was your neighbor mowing the lawn the first time?


2012 Hyundai Santa Fe, 130,000 miles, Havoline Pro DS Full Syn 5W-20, Auto7 Filter.
2014 Kia Rio, 80,000 miles, Havoline Pro DS Syn 5W-30, WIX Filter
Re: Decibel Reading After Switching Oil Brands [Re: Gebo] #4534963
10/05/17 09:03 PM
10/05/17 09:03 PM
Joined: Aug 2012
Posts: 447
North Carolina
Urshurak776 Offline
Urshurak776  Offline
Joined: Aug 2012
Posts: 447
North Carolina
Joking of course......but


2012 Hyundai Santa Fe, 130,000 miles, Havoline Pro DS Full Syn 5W-20, Auto7 Filter.
2014 Kia Rio, 80,000 miles, Havoline Pro DS Syn 5W-30, WIX Filter
Re: Decibel Reading After Switching Oil Brands [Re: Gebo] #4534970
10/05/17 09:09 PM
10/05/17 09:09 PM
Joined: Feb 2013
Posts: 76
Herrin, Illinois
CharlieW618 Offline
CharlieW618  Offline
Joined: Feb 2013
Posts: 76
Herrin, Illinois
Fresh oil vs. used oil probably accounts for the difference. shrug


Formally Charlie1935
Du Quoin, Il.
Re: Decibel Reading After Switching Oil Brands [Re: Gebo] #4534971
10/05/17 09:10 PM
10/05/17 09:10 PM
Joined: Mar 2017
Posts: 5,387
Soviet State of Washington
PimTac Online content
PimTac  Online Content
Joined: Mar 2017
Posts: 5,387
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?


2017 Mazda CX-5 Grand Touring

Valvoline Advanced Synthetic 0w20
Mobil 1 M108A EP filter

Re: Decibel Reading After Switching Oil Brands [Re: PimTac] #4535018
10/05/17 10:09 PM
10/05/17 10:09 PM
Joined: Sep 2002
Posts: 2,257
VA
Gebo Offline OP
Gebo  Offline OP
Joined: Sep 2002
Posts: 2,257
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
'07 Lex GX470 58K

Re: Decibel Reading After Switching Oil Brands [Re: Gebo] #4535027
10/05/17 10:18 PM
10/05/17 10:18 PM
Joined: Jun 2014
Posts: 2,442
Phoenix, Arizona - USA
SirTanon Online content
SirTanon  Online Content
Joined: Jun 2014
Posts: 2,442
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 - 261,000mi
2014 Nissan Altima SL - 2.5 liter/CVT - 56,000mi
Re: Decibel Reading After Switching Oil Brands [Re: Gebo] #4535030
10/05/17 10:26 PM
10/05/17 10:26 PM
Joined: Jan 2008
Posts: 1,021
TX
robertcope Offline
robertcope  Offline
Joined: Jan 2008
Posts: 1,021
TX
I love that you are trying to be scientific about this!

Re: Decibel Reading After Switching Oil Brands [Re: Gebo] #4535039
10/05/17 10:49 PM
10/05/17 10:49 PM
Joined: Sep 2015
Posts: 2,256
Malaysia
zeng Offline
zeng  Offline
Joined: Sep 2015
Posts: 2,256
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

Re: Decibel Reading After Switching Oil Brands [Re: CharlieW618] #4535056
10/06/17 12:05 AM
10/06/17 12:05 AM
Joined: Dec 2008
Posts: 2,407
CA
raytseng Offline
raytseng  Offline
Joined: Dec 2008
Posts: 2,407
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.

Re: Decibel Reading After Switching Oil Brands [Re: raytseng] #4535059
10/06/17 12:09 AM
10/06/17 12:09 AM
Joined: Mar 2017
Posts: 5,387
Soviet State of Washington
PimTac Online content
PimTac  Online Content
Joined: Mar 2017
Posts: 5,387
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.


2017 Mazda CX-5 Grand Touring

Valvoline Advanced Synthetic 0w20
Mobil 1 M108A EP filter

Re: Decibel Reading After Switching Oil Brands [Re: Gebo] #4535065
10/06/17 12:20 AM
10/06/17 12:20 AM
Joined: Aug 2017
Posts: 226
Chicago
danielLD Offline
danielLD  Offline
Joined: Aug 2017
Posts: 226
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.

Re: Decibel Reading After Switching Oil Brands [Re: Gebo] #4535079
10/06/17 01:16 AM
10/06/17 01:16 AM
Joined: Jun 2012
Posts: 1,699
USA
oldhp Offline
oldhp  Offline
Joined: Jun 2012
Posts: 1,699
USA
Go out on a limb.............put 5W20 in it, then take a reading. grin



Re: Decibel Reading After Switching Oil Brands [Re: SirTanon] #4535080
10/06/17 01:20 AM
10/06/17 01:20 AM
Joined: Dec 2002
Posts: 40,835
'Stralia
Shannow Offline
Shannow  Offline
Joined: Dec 2002
Posts: 40,835
'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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