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Posts posted by jwmbishop
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diesel for MOST cases. I probably would have gone either way until owning my F250 - 9 -11 mpg no matter what I pull!
If the vehicle will also be used for short runs (like a grocery getter) expect maint to be a bit higher though. Especially with the exhaust filter stuff on em. Diesels LOVE lots of warmup and hiway miles! short cold miles are BRUTAL.
Diesel vs gas
in Grease Monkey Hangout
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Good stuff James!
On the 6.5 once you address the cooling - the castings are real sweet. Without address - the head likes to stress crack where the precombustion chamber, head surface and cylinder wall meet up - even when coolant never goes over 225. I also recommend a GOOD harmonic balancer on it - with high miles they tend to crack the crank at the #1 main rear radius due to accessory load stresses.
The Duramax had not been produced by my retirement so I can't form an opinion based on service issues to compare.
My opinion is ANY diesel should be 125% on the cooling system - no margin for neglect - they just have harsher heat cycles which makes for brutal expansion cycles of the parts. Maintaining a constant temp becomes critical - your system should "ride" the thermostat (in other words have the ability to cool below the thermostat's value with the thermostat fully controlling temp)!