320,000-Mile BMW M5 Compared To 78,000-Mile M5 In Dyno Test

The numbers don’t lie.

In our eyes, high-mileage cars are nothing to be afraid of. Of course, that’s true only if we talk about regularly serviced and properly maintained cars, like the 320,000-mile (514,990-kilometer) BMW M5 E39 from the video above. I know the clip says the car has 409,000 miles (658,221 km) on the clock but it’s important to note that the engine was replaced by BMW for high oil consumption issues in 2003. Still, 320,000 miles (514,990 km) is quite an impressive number especially for a performance sedan.

On paper, a stock M5 E39 delivers 394 horsepower (294 kilowatts) at the crank from its 4.9-liter V8 under the hood. A quick dyno check should show whether the high-mileage M5 had lost any power and to put the numbers into perspective, the folks over from LegitStreetCars compare it with a “garage queen” M5 E39 with just 78,000 miles (125,528 km) on the clock.

The 13:12-minute video provides interesting details about tuning and maintaining the performance sedan (make sure to watch it from A to Z) but let’s get straight to the point. The dyno shows the high-mileage M5 generates 282 wheel horsepower (210 wheel kilowatts) with mass airflow sensors connected and stock tune versus 207.2 whp (154,5 wkW) for the newer M5. That’s a bit weird but the numbers look as expected with the sensors disconnected and adaptations reset – 292.7 whp (218,3 wkW) versus 309.6 whp (230,9 wkW).

The final dyno run compares the two cars with mass airflow sensors disconnected and Alpha-N tune software. And the numbers don’t lie – the M5 with fewer miles generates 346.7 whp (258,5 wkW) versus 326.6 whp (243,5 wkW) for the high-mileage hero. Still, a pretty impressive result, right?

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