Quote:
Originally Posted by TheBlizzard
Put it this way; I did a basic comparison with two oils in my GTP. First I ran Castrol Syntec with a WIX filter; and what I did was just set the factory reset to 100% and then took note of the miles, it went 5400 miles before it went to 0% and needed to be changed. I also reset the mileage averaging system at the same time; over the coarse of 5400 miles it got 23.3mpg.
Then I chaned the oil; used a new WIX filter but this time I used Amsoil Synthetic, the car went 7100 miles before it hit 0% and got 24.7mpg on the average. My driving styles didn't change either; I still beat the shit out of the car like I always do.
I am sure in both tests I could have went further with the oil but I just change it anyway. But I will note that neither oil showed much sign of break down when I changed it. And it was still at the exact full line when I changed it both times. So from the looks of it they were the same, but the numbers showed different in my case.
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Craig, I doubt that computer on your GTP has any type of true oil analysis capabilities. My guess is that it calculates the oil life left based off of time, engine RPM, ambient temp, engine temp, and throttle position. The Amsoil lasting longer and getting better MPG leads me to believe the car was either driven easier (even if you didn't knowingly do it) or the ambient temp was more moderate (not really cold or really hot). I am not arguing with you here because I know that Amsoil does make a good product and it always performs very well in tests and comparisons.