This is a weird one. Yesterday I changed my oil, and wrote down that my mileage was 38,104. Today I took the car to the dealer to have new rear tires installed, and the mileage was written down by the service writer as 38141. Yet when I get the car back, the mileage reads something like 38400ish.

I know the dealer didn't take the car for a 300 mile joyride, because I had the car there only 1 hour, and I waited there and checked on the car frequently.

Can anyone help explain what may have happened here???

 

 

doesn't seem possible at all. my guess is the service person is dislexic and wrote down 38141 instead of 38411, and seeing that on the service paper, changed your perception of what you thought the mileage was (perhaps 38104 instead of 38401).

 

The thing is, when I changed my oil yesterday it was 38104, i checked it several times, and i only drove about 20-30miles today??

 

Ferris Bueler ???

 

Yes, just put the car on jack stands and leave the car running in reverse.

 

Ha ha, won't work on this car. I was shocked to see the speedometer work in reverse.

What I want to know: If I drive backwards for a while, will the odometer go up?

 

i have always wondered about that

 

Icemn, the answer to your question is obvious once you understand the technology that exists within the S2000.

As you know the distance travelled in one wheel revolution is determined by the rolling circumference of the tyre. As I'm sure you also know, as the tyre wears the circumference of the tyre wil also reduce.

What has happened is that now that you have replaced your worn tyres with new ones (which have a larger circumference), the smarts in the S2000 internal computer have automatically adjusted your mileage up to reflect this new circumference (and actual distance travelled).

300 / 38400 is approx 0.7% which is just about the exact difference in rolling circumference between the old and new tyres.

Amazing vehicle the S2000 isn't it?

 

Reset your trip-meter and drive in reverse for 2 blocks to find out.