Quote:
Originally Posted by noro
Sorry man, I can't say I agree with you. The best way to sell a new car is have the old model of the car rolling on the streets. Volvo's reputation of durable and strong cars was not built by ads but by having the 740 wagons tote around the streets decades after they were sold. If you examine an automobile as whole and list all possible things that can make it last longer you will discover that doubling the frequency of synthetic oil changes on modern engines is the least effective way to spend your money.
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It's cool, but do you have any source for your last statement?
For my side of the argument, someone actually has done a study on the dirty oil for an N54 engine. The results are below:
-High iron count which was 3 times the average of those who have changed at 5500 miles
-High Nitration, which indicates the oil was used longer then it should have been.
-Viscosity higher then average. Remember, viscosity testing is done at 210 degrees farenheit, which is 40-60 degrees lower then normal operation oil temps in the n54 engine. Viscosity is thought to have a direct relationship with oil temperatures. Higher the temperature, the more the oil loses its strength. Now imagine what the viscosity is at 250-270F.
With those things being said and from speaking with several different fluid dynamic engineers, BMW is wrong for saying it's ok to change the oil for the n54 engine at 15,000 miles, especially with higher then average oil temperatures.
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