The 6.0L is a good engine.
All the crap ford put on that engine to make it emmissions legal caused most of the problems.
You will have to do at least 2 things to make them dependable and get better milage.
1 run an aftermarket ECU program to control the engine.
2 Delete the EGR (it leaks coolant into your intake).
You should strongly consider a 3rd item since you want to tow that 8k trailer...
3 Replace the OEM's oil cooler thermostat assembly.
Or get an older duramax.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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