Thanks for pointing that out.

The newer engines = everything made after the OM617 has a small fuel pre-heater.
Please note:
The factory pre-heater is not adequate for extreme/arctic conditions.

If you live in a far northern state, Canada or Alaska, additional pre-heating may be needed.

Examples:

Bemidji, Minnesota
Stats: Average temperature during winter months are −30 °F (−34 °C) to +10F.
Cold weather testing is big business | Minnesota Public Radio News

Barrow, Alaska
Barrow, Alaska - Wikipedia, the free encyclopedia