The change oil light will come on at different millage points depending on the driving conditions encountered between oil changes. The 8.1 oil capacity is seven quarts with filter change and there are two different sized filters for the engine if one prefers a larger filter. The problem can pop up on any given day or even every other year. There have been some check engine codes set,due to the O2 sensors, and it is an intermittent issue,that in most cases just requires removing the ECM code. These engines are built for torque not high RPM numbers They are not warranted for 300,000 miles though!!! Deliver companies do run engines hard and long! The mechanical portion of the 8.1 was built to run 300,000 miles if all service intervals are met and the rpm's are not pushed. Just the difference in the level of ECM control on the newer engine. The 454 engines tend to have more mechanically set ignition and timing then the 8.1.
and they get about the same millage in regards to weight ratio. gas, 454's like the middle grade,but will run on Reg. numbers !! I have not heard of any problems with the engine with the up graded parts, because the sensors where improved. There was a recall from NTSB regarding these issues.Most where in the large work trucks and GM did not want to include engines that where outside there recalled VIN. The early 8.1 engines had an issues with Cam and Crank sensors. Just some personal side notes on the 8.1 and 454's, They do use the same block,but that is where it ends. Just things to look out for, and all things that are expected. Also, check the generator, which may not have seen much use, but should have been run periodically. Also have a qualified mechanic check out the belts and hoses, all will age without regard of mileage. The tires are probably original, and therefore way past the 5 to 6 year safe age. Even though the MH has very low mileage, it is still a 2002.
Both will tow a light car without difficulty. Gas mileage is similar, seldom reaching 8mpg. Traveling on the flat midwestern plains, I don't think you will find much difference. With the previous Ford and the current Workhorse I can make the grade at 50 t0 55mph without difficulty. With my 454 in a Holiday Rambler 36ft, traveling over the Grapevine (a long hard mountain climb leaving Los Angeles on I-5) would drop us to 25 or 30 mph. So, if you live out West and need to travel over the mountain the newer Workhorse or Ford V10 give alot more power on the mountains. I've owned both, and I have very little technical background in engines.
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