True. There a numerous engine manufactures that recommend no higher than B5 blend.
I wonder if it is EGR...Bio Diesel burns SO MUCH cleaner.
Is it they have not done enough research.....that cost $$$
Most of the pre 2000 coaches would have issues burning say B20 or higher due to what the fuel lines are made of NOT Bio Diesel blend.
The newer coaches have the Bio Fuel comparable fuel lines. Is it just a matter of time before the up the allowable Bio Blend standards in the warranty department ? Time will tell.
I know MOST states are mandating a Bio Blend because the Bio blend burns much cleaner so it may be just a matter of time before 100 percent ULSD is gone.....Good. At least they are replacing the lubricants and cleaners they removed when they went from LOW sulphur diesel to ULSD with a B5 blend.
I agree that the Pilot and or Flying J personnel should know what is in their tanks but I also think it varies a little from load to load. The I information I have from the long haul truck side, including the newer rigs, and yes some of the BIG rigs run Maxxforce engines is the blend is usually in the B10 range and I would, and do run, that all day long.
If Navistar wants to test my fuel if I have an engine problem, well that will be a whole new battle. I will continue to purchase fuel from Pilot and Flying J and Murphy, they are starting to blend also. I keep almost all my fuel receipts for at least 12 months. Helps to know if I get bad fuel...not yet...but if, maybe I can trace where it came from.
I know study this is from the small truck market but it is just the tip of the study, if I find the BIG RIG study in my files I will post it.
My father is a 3 million mile plus long haul trucker and I have driving diesels and been around them quite some time and really enjoy reading diesel information. I read tech manuals and studies just for fun, I have been doing it for years.
This is why we run additives in our new engines. The rail pressures in the new engines have increased so much over the last 10 years that those high pressure fuel pumps and injector are working hard and just need a little lubrication love.
Safe Travels !