Dyno testing is one of the most common reasons US car owners use a mileage blocker. Whether you’re tuning your BMW M3, mapping a Porsche 911 or testing your Chevrolet Corvette’s power output, every dyno run adds real miles to your odometer — without the car moving an inch on the road.
How Many Miles Does a Dyno Run Add?
A typical dyno session lasting 2-3 hours can add anywhere from 20 to 80 miles to your odometer depending on the number of runs, the speed reached during each pull, and the time spent warming up and cooling down. For a car worth $100,000+, those extra miles can cost you thousands at resale.
How a Mileage Blocker Solves This
A vehicle-specific mileage blocker from Mileage Blocker USA plugs into your car before the dyno session begins. While active, it intercepts the speed signal at the CAN-Bus level before it reaches any module — so zero miles are added to your odometer, trip meter, or any stored ECU memory during the entire session.
Which Cars Need a Mileage Blocker for Dyno Use?
Any vehicle that stores speed data across multiple modules benefits from a quality CAN-Bus mileage blocker — this includes virtually all modern cars built after 2005. The most popular dyno vehicles among our customers include:
- BMW M3, M4, M5
- Porsche 911, Cayenne, Macan
- Chevrolet Corvette C8
- Mercedes AMG models
- Lamborghini Huracan and Urus
Is It Legal?
Using a mileage blocker during legitimate dyno testing is entirely legal. Our devices must not be used to misrepresent mileage when selling a vehicle. Learn the difference between a mileage blocker and illegal mileage correction here.