250k + miles on my 6.5
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Your truck has plenty of life left in its a chevy but the engine however depends you could have 10 miles left or 150,000 miles to help determine check for blue smoke on startup or while engine is running open oil fill cap and c if anywhite smoke puffs out (blowby) if little or none puffs out your good for a few more years at least but if excessive smoke engine is in poor health. Diff factors will help add to life of the 6.5 to an extent keep up on maintenence oil changes, when you start truck dont take off right away like you would with a gas powered vehichle let it idle for 3-10 minutes for it to warm up properly to ensure thinner oil to contact bearing surfaces better as well as with fueling add a few ounces of two stroke oil to every tank of diesel for better lubrication for fuel system as todays diesels have low sulfur n hardly any lubrication..lastly baby that throttle!! and keep towing within spec limits.
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Yea i here ya on the 55 thing i have 410 gears ha. but im not too sure on the straight pipe ive been lookin at ssdiesel supplies 4" aluminum full exhaust fer good price but i hear everyone with 6.5 s always talkin about diamondeye exhaust..few min googling it n finding what works best for your preference and price range
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