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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / November 2006Engine quieter after oil change.
In every car I have owned the engine sounds quieter at idle just after an oil change. But why? If the engine oil is good for 3000 miles or 3 months shouldn't the sounds be the same.? >In every car I have owned What kind of cars are these? >the engine sounds quieter at idle just after >an oil change. But why? >If the engine oil is good for 3000 miles or 3 months shouldn't the >sounds be the same.? Do you let it get 2-3 quarts low between changes? Do you check the level between changes? Don www.donsauotmotive.com > In every car I have owned the engine sounds quieter at idle just after > an oil change. But why? > If the engine oil is good for 3000 miles or 3 months shouldn't the > sounds be the same.? I suspect you are suffering from the plesbo effect. I know I used to swear my car ran better after I washed it. If you really think the car is quieter after an oil change, maybe you should borrow a sound level meter and make measurements. Be sure to compare a cold start with the old oil to your fresh oil.  SignatureRegards, Ed White http://home.mindspring.com/~ed_white/ - my automotive opinions http://home.mindspring.com/~ed_white/id7.html - my oil filter comparison > > If the engine oil is good for 3000 miles or 3 months shouldn't the > > sounds be the same.? Well, the change interval doesn't mean the oil is as good as new -- it merely means that it's still good *enough*. It will have gained some contaminants both solid and liquid, and lost some volatiles, and undergone some breakdown of the more complicated molecules. It is not the same stuff you put in. Well, sure! That's why you're changing it! > I suspect you are suffering from the placebo effect. Could be. I've noticed the effect too, and others have remarked to me about it. > borrow a sound level meter and make measurements. You might be even better advised, if possible, to look at the power spectrum of the sound. My (possibly self-deluding) observation has been that the engine doesn't get hugely quieter, but that the character of the sounds improves. It seems a bit quieter, and... smoother. Cheers, --Joe > In every car I have owned the engine sounds quieter at idle just after > an oil change. But why? i have noticed this same phenomenom after oil changes, also. is it really a placebo effect or is there really a difference? the only time i didn't notice a change was with the 440 Dart that i used to drive. bob z. > > In every car I have owned the engine sounds quieter at idle just after > > an oil change. But why? [quoted text clipped - 4 lines] > > bob z. Part of it probably relates the the notable drop in sound level when you finally get oil pressure 5 or 6 seconds after the start once the oil filter has filled. Pete C. Bob you had a 440 Dart, tell me more. >> In every car I have owned the engine sounds quieter at idle just after >> an oil change. But why? [quoted text clipped - 4 lines] > > bob z. I'm thinking he couldn't hear the valvetrain over the exhaust. I know that if *I* had a 440 Dart that would be the case <G> nate > Bob you had a 440 Dart, tell me more. > [quoted text clipped - 10 lines] > http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups > ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- Signaturereplace "fly" with "com" to reply. http://home.comcast.net/~njnagel > Bob you had a 440 Dart, tell me more. it was a 1973 Dodge Dart Swinger - 2-door. it started life as a 225 slant-six. a 318 fell into it and stayed for exactly one year. 440 went in with 9:1 compression 750 holley vacuum secondary edelbrock torker II intake 906 casting heads 2.14/1.81 valves first cam: mopar performance purple .484 lift (don't remember the duration) second cam: mopar performance purple .509 / 292? third cam (not to be bitten by the junk purple cams and wiped lobes): compcams mechanical .495 / 282? this compcam was MEAN. 2" under-chassis headers (http://www.chryslerpower.com/) - these headers required some careful useage of wrenches, sockets, extensions, swivels and double-jointed arms for spark plug replacement. oh yeah, don't even think about changing the starter without pulling the engine first. how many starters did i go through before i bought a good one? you don't want to know... 727 torqueflite with reverse pattern manual valve body (not for street use - yeah, right). 3500 rpm 10" GER converter 3.23 geared 8.75" sure-grip rearend (tried a 3.91 for a little while - too much gear) i drove this car daily for a year straight. snow, wind, rain, blizzard, etc. the manual valve body helped with the starts on slick surfaces - put it in second, still spin? put it in third! it was a very fun car to drive and as dependable as anything out there. i regularly spun it to 6500rpm. crusing at 30mph in second gear and then stomping the gas pedal was always a nice way to clean the rear tires... bob z. |
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