Maybe the FSS is not as smart as we think, I've driven a hundred miles on the new oil and FSS now reads 3900mi until service is due. This means that FSS does not know the difference between oil that has been in the engine for 7K or 100mi. It's still counting down to the A service.
Since I'm running fresh Mobil1 15-50 with a new filter and a complete drain (it took 9L to fill), FSS should give me what another 7-8K miles until an oil change is required?
On another post I state that I have never trusted leaving the oil in my engine for more than 4K miles or six months, whichever comes first. But I know many people who are trusting FSS and I think we will only know the results of that trust circa 2005. Then we will have a picture if engine repair frequencies have risen or not.
I agree with the idea to conserve oil, and I think if I was trading the car in after 3-4yrs, I wouldn't care if FSS is reliable or not. But, when I select a car, hopefully it's a keeper...
Ed "Don't Benz's just feel better..."
2000 ML430 Skyview "The Mel"
2000 CLK430 Cab "The Cab"
85 300D Turbo "The Diesel"
"One should as a rule respect public opinion in so far as is necessary to
avoid starvation and to keep out of prison, but anything that goes beyond
this is voluntary submission to an unnecessary tyranny, and is likely to
interfere with happiness in all kinds of ways."