Clean oil reduces engine noise?

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It's that the oil has not sheared down yet, so it is slightly higher in polymeric VIIs that have not broke down at that point, so the oil has a better "dampening" effect of sound.

I would imagine a difference in sound between Havoline DS (thin) and Castrol GTX (thick), as well as a difference between 5w30 and 10w30.
 
Engine noise of my '00 MB E430 at any RPM is much quieter with Pennzoil Platinum 5w20 vs Mobil 1 0W40 which is the recommended grade. It is not placebo effect because my wife told me the car was quieter the first day she drove it after the oil change.

The added benefit is gas mileage increased by more than 3% with similar driving conditions.
 
Originally Posted By: HTSS_TR
Engine noise of my '00 MB E430 at any RPM is much quieter with Pennzoil Platinum 5w20 vs Mobil 1 0W40 which is the recommended grade. It is not placebo effect because my wife told me the car was quieter the first day she drove it after the oil change.

The added benefit is gas mileage increased by more than 3% with similar driving conditions.


You are running 5w20 in a German auto?! The horror!
 
It is somewhat hard to believe that a thinner oil cushions all of those metal pieces slapping together better than a thicker oil. How can that be?

The last time I noticed much of a difference in engine sound with an oil change must have been back in the 60's. In those days, my engine (usually a Chevy V-8) would announce the need for an oil change by the valve lifters beginning to tick. This happened with regularity right at the 3000 mile mark. In those days, I usually used Quaker State Super Blend, and I seem to recollect that it was marked 10W-20W-40. An oil change was not complete before I added a can of STP.

With the advent of the 70's, and Mobil 1 synthetic, I immediately changed to it, and haven't added anything to my engine oil since then. They said it was good for one year or 25,000 miles, and I took them at their word, usually driving 18,000 to 20,000 miles a year. I kept the oil topped up and checked frequently, and never had a valve tick with up to 20,000+ miles on an OCI.
 
I had a 99 Dodge 2500 with the Cummins Turbo Diesel, and of course a diesel is loud. I changed the oil and filled with Rotella T synthetic, I thought myself it was much quieter, but also thought just a placebo effect, however I didn't tell my daddy about anything, he made the comment that it was a lot quieter thane he thought... So maybe in some cases it does really work.
 
The Lamborghini Murcielago that my wife drives had a noisy engine with clicks. I changed the OEM 5W-40 Agip for 0w30 Mobil 1 and it was much more quiet. I later changed to Red Line 5W-20 and it was even more quiet. I since changed to Renewable Lubricants (RLI) 5W-20 - the thinnest oil at room temperature I have ever seen - and the first thing my wife noticed was the silence of the engine. It was even better than the Red Line.

aehaas
 
AEHaas said:
The Lamborghini Murcielago that my wife drives had a noisy engine with clicks. I changed the OEM 5W-40 Agip for 0w30 Mobil 1 and it was much more quiet. I later changed to Red Line 5W-20 and it was even more quiet. I since changed to Renewable Lubricants (RLI) 5W-20 - the thinnest oil at room temperature I have ever seen - and the first thing my wife noticed was the silence of the engine. It was even better than the Red Line.

A post I thought I would never read on this site that had the words...wife, drives, and Lambo, in the same sentence.
thankyou2.gif
 
1/2 qt of Pennzoil Platinum 5w20 into the Rotella 5-40, or Maxlife 10-30 or Maxlife 10-40 always made my 4.0L jeep much quieter. Lifters were otherwise quite a racket.

M
 
I have a motorcycle with solid lifters,that calls for motorcycle 10w40 oil.
Using automotive oil,10w40 weight,will cause a noticeable difference in valve train noise.
Since the motor is right next to me,it is easily noticeable,as I tried it years ago for winter storage.
I immediately removed the oil and replaced it with super tech synthetic 10w30.
The noise immediately went away,and I've been using it ever since.

I know for a fact,certain oil formulas protect better,and the advertised weight may or may not have a difference.
 
Originally Posted By: Camu Mahubah

You are running 5w20 in a German auto?! The horror!


Only few drivers like Aehaas ... have the gut to try thinner oils in a car that recommends thicker oils with minimum HTHS of 3.5.

I tried Pennzoil Platinum 5w20 because I came across the article that Aehaas wrote about his choice of thinner oils for his Lambo, Ferrari Enzo ...
 
Then there is the car running 0w30 instead of the OEM 10W-60, the Enzo.

enzoowner.jpg


There was no change, with both oils the engine was quiet from the start.

aehaas
 
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