How many miles do you run before you change your oil?

Crank should be the same. Bearing wear may be something else. Changing damper on a crank would make the difference on crank longevity more than the oil.

 

I change mine every 250 hrs I Run heavy in severe conditions in the Arizona and New Mexico desert.

 

Not sure where you run makes a big difference. Engine oil is run thru a cooler. Engine oil doesn't get any hotter than the coolant temp. Not going to get any hotter in AZ than running heavy in PA or IA in the summer time. You do have an oil temp gauge, right? Is you oil reaching 300F? If it is, then you have issues other than the oil. Maybe dust and dirt would be the only difference where you are, but that depends on if you leave the hard road frequently.

 

Of course not, everything revolves around ME!

 

I currently have 260k on my engine since the last oil drain. I sample at 25k and let the sample findings tell me what I need to do. I run a Volvo D12 which has 855k on it. The engine has three factory filters and I added the OPS unit, which makes four filters total. I have been using Rotella T6 or Mobil 1 Turbo Diesel found on the shelf at Walmart. My oil samples are perfect and the reports show no reason for concern. My engine is healthy and clean burning. I have seen both the top end, during overheads, and the bottom end, during a pan gasket change, and there is no sludge or scared metal surfaces indicating the need for concern.

The import thing to note is I said ' oil drain '. It is not 260k on the same 9 gallons of oil. At either 25k or 50k, which ever you are comfortable with, you change all the filters. The OPS filter is always changed at 25k. This adds approximately 3 gallons. So if changing all your filters at 25k you technically have changed the oil in the engine every 75k, or 150k if you do them at 50k.

Oil sampling does identify internal problems with the engine. Example, on the last sample my fuel dilution jumped a little. In its self it was not a big deal but my engine has always had practically zero dilution, previous samples confirm this. So something was up with the fuel system. I had no codes and the truck was running fine. Fast forward a few weeks and I start to get a low fuel pressure warning. Ultimately it turned out to be a bad fuel pump. The internal bearings of the pump were failing. The failure was causing fuel to seep pass a gasket and contaminate the oil, very marginally but still contaminate it. So the point is, that my oil sample picked up the start of the failure before the engine ECM even registered the fault. The samples act like an early warning system. They Can't diagnose the problem but will point you in the right direction.

 

I change at 25k and it's still a total waste... my oil samples come back in "like new" condition. This is in a 700hp C15 pulling tankers around the hilly two-lanes of PA. Not exactly an easy life. BradPenn Semi-Syn 15w-40... I wouldn't run anything else. It could cost double what it does, and I could get anything else for free and I'd still buy and run BradPenn. It's the only oil left on the market that's still made from PA crude.

 

We change the oil/filters at 35k km. we perform an in house oil sample at 20k, and a lab sample at the change.

Oil has always come back A OK!
1.3mil on the Detroit..(Shaker)
200k since in frame on the Cat (Peterbilt).

... Philip

 

Oh really? Care to expand on that statement?

 

.

 

Curious about that myself.