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jwmbishop

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Everything posted by jwmbishop

  1. 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)!
  2. 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.
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