I was told, and still do today, try to run the car with wide open throttle for at least 20 second, every month or so. Easy to do with trucks and most passenger cars, but in high performance cars you need some open road. My last car would be north of 140mph by then. Never had any heavy maintenance in any of my cars, all were sold with over 100k on the odometer.
My grandfather had a couple of BMWs right before the speed limits changed. I think he regretted selling them, but he always said that at 55MPH they would choke themselves on carbon. You had to run them all open.
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