If you are unable to meet this part's requirements with engines using noncommercial fuels (such as unrefined natural gas released by oil wells), the following provisions apply for those engines:

(a) Create a separate engine family.

(b) Disregard the limits on adjustable parameters in §1048.115(e), but make sure the engines meet emission standards with normal settings when the engine is using fuel meeting the specifications of 40 CFR part 1065, subpart C.

(c) Add the following information to the emission control information label specified in §1048.135:

(1) Include instructions describing how to adjust the engine to operate in a way that maintains the effectiveness of the emission-control system.

(2) State: "THIS ENGINE IS CERTIFIED TO OPERATE IN APPLICATIONS USING NONCOMMERCIAL FUEL. USING IT IN AN APPLICATION INVOLVING ONLY COMMERCIAL FUELS MAY BE A VIOLATION OF FEDERAL LAW SUBJECT TO CIVIL PENALTY.".

(d) Keep records to document the destinations and quantities of engines produced under this section.