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Have put over 600k on a series 50. Everything said above is correct, it is a great engine. This engine was used in a lot a city bus fleets. Last September I was ready for an inframe at 1.2 million miles. I found a factory reman than was pulled out of a city bus that was pulled from service...

If you don't have one, install a vacuum boost gauge and use it when driving. Keep your boost as low as possible when accelerating and climbing hills. It will correct a lot of bad driving habits and you will see a definite boost in your mpg. Also, if you have a boost gauge and a pyrometer you can...

Have run them for over 600K miles. Better ride, better fuel mileage, never had a flat. Will not run anything else

I had the "rivering" problem on a set of Yokohama steer tires last year. I had it into front end shops, had md alignment check out the alignment and front end. Everything was good. I talked to a number of tire men about the problem and only had one give an answer that sounded plausible. He said...