Advice on maintenance plz

ford2018tx

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Hello everybody hope yall are having a great day i was seeking some advice please. I have my first diesel truck a 2013 duramax lml with 197,340 miles i recently bought that runs great no check engine lights or anything i did the oil change about 1,400 miles ago and the fuel filter 900 miles ago im fixing to take over a business and need my truck to stay running at top shape so i can pay off the business and get my self a back up truck asap.my main question is should i delete my def so i can prevent any issues with it anytime soon? My second question would be should i change my glow plugs aswell? I wanna change the transmission fluid,filter,gasket along with the transfer case fluid and the differential fluids aswell any tips and advice would be greatly appreciated thanks in advance!
 

Oledirtypearl86

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If it was mine check all fluids and change not flush tranny with a new filter leave the def garbage alone until the first sign of problems but save a few pennies for the delete and flash if you want it to last for a while do a stock without emissions that's a 70 HP gain on the ezlynk I wouldn't mess with I to much I see duramaxes all the time biggest issue is shitty high hp tunes and big tires
 
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