Fuel dilution of lubricating oil has been observed with the use of biodiesel fuel. Fuel in oil must not exceed 5%. To ensure this limit is met your oil change interval must be maintained to the following schedule:
Ram PickUp 2500/3500 Only — 15,000 miles (24,000 km)*
(*unless otherwise notified with an oil service message.)
Under no circumstances should oil change intervals exceed 15,000 miles (24,000 km) if operation occurs with greater than 5% biodiesel blends. Oil change intervals should not exceed 6 months in either case. Failure to comply with these Oil Change requirements for vehicles operating on biodiesel blends up to B20 may result in premature engine wear. Such wear is not covered by the New Vehicle Limited Warranty.
B20 Biodiesel capable: The engine may suffer severe damage if operated with concentrations of biodiesel higher than 20%.