Engine Hours Evaluation.....

I crate motored my first Cat 3126B in my ‘99 at around 471,000 it had around 9,500 hrs on it. It ran about 50 hrs a week.
I changed oil every 8,000 at about 300-350 hrs

 

I just calculated the total on the ‘99 FL 60 from my record book. Total miles on truck 1,005,686.7
Total instrument clocked engine hrs. 34,719.9 on its 3rd overhaul.
Calculates to 28.9 mph. I’m slow and it did take me 16 years to get there. Lol

 

Typical oil change intervals are usually between 250 and 500 hours.

 

Ehh 30k on a newer engine is fine... Until it isn't, lower hours/miles oil changes are just better insurance and give you more chances to find things going bad before they become catastrophic

I like 10k +/- 2k for me, ideally more often in summer since I idle more then

 

30k miles of 60 mph average speed vs 20 mph is a HUGE difference.

 

I don't disagree, good point

(I'm still the worst kind of right, it'll be fine... Until it isn't )

 

When you pull the dipstick do you hear ominous screams from hell coming from the sump tube? That’s way to long on that little engine especially if it idles a bunch. Too much time is being put on that oil. Those only hold about 6.5 gallons and 1 filter. Not twice that like the big boys.

 

And people wonder why it's generally a bad idea to buy used fleet trucks.

As far as where in the recommended range you should change the oil, manufacturers literature usually ties it to fuel economy; low fuel economy = severe service = more frequent oil change intervals, high fuel economy = normal service = regular oil change intervals. This covers high idle times (hard on engines) because your fuel economy suffers when idling.