what year did cars go from 5 digit odometer readings to 6 digit readings?

I can't give you an exact year because I can't find it. However, I have to say that 1993 is not correct. My car is a 1991 and it had 6 digits not counting the white one. And I called a buddy who has been a mechanic for 35 years. He says it varied on the vehicle Manufacturer. It was late 80s to early 90s. My mechanic buddy has worked at Corvette Village, Has his own shop, and worked in the shop part as a mechanic then lead mechanic at Toyota. I car is a AMC/Eagle vehicle. If you look through Yahoo Answer this question has been asked many times. It was some time in either the late 80s to early 90s. I can only say that 1993 is incorrect. I am the original owner of my 1991 car that has the 6 digit odometer no counting the white one.

I had an 83 gmc that was 5 digit and an 89 Chevy truck that was 6 digit so sometime between the the two..

Depends on the model. I saw a low mileage original 87 Firebird with a six digit odometer. 100,000th place read 0.

1993.