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Message: <blockquote data-quote="sstec" data-source="post: 60183" data-attributes="member: 5862">Mike,My 873 is 1999, at the time that was a tier 1 rated off road engine.<a href="http://www.dieselnet.com/standards/us/nonroad.php" target="_blank">http://www.dieselnet.com/standards/us/nonroad.php</a>If you want to read more about tier rating and the EPA BS.It all has to do with rated HP on the old fuels and ppm discharge out the exhaust.The Diesel Service adds cetane which the higher cetane delays the combustion we would get with ultra low sulfur fuels, in turns gives us cleaner burning and higher HP.As far as how I like my 873.... Would not trade it for a new model.Has the lift and HP I need and love. When ever someone tries it out who has a 600 or 700 series they want to trade me theirs and cash.I think people get a little freaked out about the timing belt issue, but once you change it and see what goes on with it, its no big deal.sstec</blockquote>