Engine Oil - Diesel Engine - Jeep Wrangler Owner's Manual

CAUTION!
Do not use chemical flushes in your engine oil
as the chemicals can damage your engine.
Such damage is not covered by the New
Vehicle Limited Warranty.
Engine Oil Selection – ACEA Categories
For countries that use the ACEA European Oil
Categories for Service Fill Oils, use engine oils
that meet the requirements of ACEA C3, and
that are approved to MB 229.31 or MB 229.51.
Engine Oil Viscosity – 3.8L Engine
SAE 5W-20 engine oil is recommended for all
operating temperatures. This engine oil im-
proves low temperature starting and vehicle
fuel economy.
The engine oil filler cap also shows the recom-
mended engine oil viscosity for your engine.
For information on engine oil filler cap location,
refer to "Engine Compartment" in "Maintaining
Your Vehicle" for further information.
NOTE:
SAE 5W-30 engine oil approved to MB
229.31 or MB 229.51 may be used when SAE
5W-20 engine oil is not available.
Engine Oil – Diesel Engine
Checking Oil Level
To assure proper engine lubrication, the engine
oil must be maintained at the correct level.
Check the oil level at regular intervals, such as
every fuel stop.
For vehicles equipped with a Diesel Particulate
Filter (DPF), it is acceptable to have an oil level
up to 3/8 inch (10 mm) above the MAX line.
Beyond 3/8 inch (10 mm) it is recommended to
change the oil.
The best time to check the engine oil level is
about five minutes after a fully warmed engine
is shut off or before starting the engine after it
has sat overnight.
Checking the oil while the vehicle is on level
ground will improve the accuracy of the oil level
readings. Maintain the oil level between the
MIN and MAX markings on the dipstick. Adding
1 U.S. Quart (0.95 L) of oil when the reading is
at the MIN mark will result in a MAX reading on
these engines.
Engine Oil Selection – 2.8L Diesel Engine
Use only Diesel Engine Oils conforming to API
(American Petroleum Institute) Quality CJ-4 or
CI-4. For countries that use the ACEA European
Oil Categories for Service Fill Oils, use engine
oils that meet the requirements of ACEA C3.
Engine Oil Viscosity – 2.8L Diesel Engine
For vehicles equipped with a Diesel Particulate
Filter (DPF), 5W-30 ESP fully synthetic, low ash
oil that meets Chrysler Material Standard MS-
11106 must be used.
For vehicles that are not equipped with a Diesel
Particulate Filter (DPF), 0W-40 ESP fully syn-
thetic oil that meets Chrysler Material Standard
MS-10725 may be used.
Synthetic Engine Oils
You may use synthetic engine oils provided the
recommended oil quality requirements are met,
and the recommended maintenance intervals
for oil and filter changes are followed.
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