RAM 1500 2WD 2021 Owner's Manual page 479

NOTE:
If Climatized or Number 1 ULSD fuel is not avail-
able, and you are operating below 20°F (-6°C),
in sustained arctic conditions, Mopar Premium
Diesel Fuel Treatment (or equivalent) is recom-
mended to avoid gelling.
CAUTION!
Mixing of engine coolant (antifreeze) other

than specified Organic Additive Technology
(OAT) engine coolant (antifreeze), may
result in engine damage and may decrease
corrosion protection. Organic Additive
Technology (OAT) engine coolant is
different and should not be mixed with
Hybrid Organic Additive Technology (HOAT)
engine coolant (antifreeze) or any "globally
compatible" coolant (antifreeze). If a
non-OAT engine coolant (antifreeze) is
introduced into the cooling system in an
emergency, the cooling system will need to
be drained, flushed, and refilled with fresh
OAT coolant (conforming to MS.90032), by
an authorized dealer as soon as possible.
CAUTION! (Continued)
Do not use water alone or alcohol-based

engine coolant (antifreeze) products. Do
not use additional rust inhibitors or anti-
rust products, as they may not be compat-
ible with the radiator engine coolant and
may plug the radiator.
This vehicle has not been designed for use

with propylene glycol-based engine coolant
(antifreeze). Use of propylene glycol-based
engine coolant (antifreeze) is not recom-
mended.
(Continued)
TECHNICAL SPECIFICATIONS 477
9