Originally Posted By: 74DartSport
Wife's car, her daily commute changed from a 13 mile highway run to a 9½ mile local street trip. Time oil in service went up. .............
Wish cars had revolutions counters! Mileage is one thing, but a highway run obviously puts you in a higher gear, so engine revs are down.
Anybody know how to get the GM OLM in the computer to output engine accumulated revs to the OBDII port? Like to see that. (I read where the GM OLM algorithm actually counts revs, then of course heavily penalizes you for cold driving, less so for hot running, etc.)