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Old Nov 30, 2019 | 07:27 PM
  #1  
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Frank79
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performance loss

Ive only owned gas engines until recently. One thing I have noticed on my gassers is they seem to lose that spunkyness after quite some time. Engine gets a little sluggish, not as peppy anymore etc etc. Ive always kept up on maintenance, but I never seem to be able to get back that new truck power.

Do diesels react the same way or is it ***** to the wall for its entire life?
 
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Old Dec 1, 2019 | 05:21 PM
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They have always produced the same power after break in as toward the end of their service life, as long as the injection system stays good. I have seen them limp along almost unnoticed with low compression, blowby, ect. Power still remains good. Gassers seem to lose power with valve issues and compression but I have ran them into the 200k range with no real issues. Or noticable power loss. Maintenance is key as always. Cj
 
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Old Dec 1, 2019 | 05:54 PM
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I too have only ever owned gas HD trucks. My former V10 as it gained miles I never thought it was losing power until I did a big "early" preemptive parts refresh.
I did plugs, coils, fuel filter, MAF clean, air filter in one hit and it was like getting a new truck.
The modern extended maint. intervals let things gradually fall out of spec until I feel you dont really see the drop off.
My truck was not "due" for any of those changes by the book, except maybe an AF and MAF clean, but when I did it all at once and early it felt new again.
Just an observation.
It only reinforced to this old guy to follow the old school maint schedules I grew up with and ignore the new extended (what I feel is deferred) maint.
Cheers
jimmy p
 
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Old Dec 1, 2019 | 06:31 PM
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Probably about the same. My last long term gas 6.2 ran fine but was showing its age and ran better on 89 octane.

My experience with higher hour diesels is tractors and they loose their edge after lots of use.
 
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