My experiences over the last two decades are much different than yours. The biodiesel added into the blend makes a better lubricity enhancer than anything you could add. I’ve run B5 in old Benz diesels, a first-gen Dodge Cummins, and three different Toyota LandCruiser diesels. I’m currently running it (when I can find it) in a BMW X5, a Ram Ecodiesel, and a Mitsubishi Delica diesel. ALL of them have done well on the stuff.It will run it, sure. Until the lift pump or injector pump or injectors wear out prematurely. Many studies have been done on additives for the older diesels. I did an impromptu study myself when I first got my diesel and wound up with a bad pump on the highway while towing a large trailer right next to a sign that said "no services this exit". After a very expensive tow bill I did a lot of inquiring.
in this link you'll find a pdf from bosch about ULSD that was written before the ULSD was federally mandated about premature wear on pump components.Low Sulphur Diesel - Beware and Remediate
Ultra Low Sulphur Diesel was NOT the norm when your vehicle was produced. We highly recommend owners read this bulletin directly from Bosch. Cliff Notes: Use a Fuel Additive such as Stanadynesupport.expeditionimports.com
B5 is certainly better than B20 but ULSD has poor lubricity for pumps and injectors compared to the older D2.
I experimented with b20 and got terrible mileage to boot. B20 was 10% cheaper than B5 and resulted in 20% less fuel economy on the same trip with the same vehicle. I was looking into B100 as a fuel source but quickly decided against it.
Biodiesel—even in concentrations as low as B5–performs the lubrication function that sulphur used to perform in diesel fuel. That’s been proven many times over.
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