Chrysler 2004 PT Cruiser - Manual (Page 254)

American Petroleum Institute (API) Engine Oil
Identification Symbol
This symbol means that the oil has
been certified by the American
Petroleum Institute (API). The
manufacturer only recommends
API Certified engine oils.
Engine Oil Viscosity (SAE Grade)
The proper SAE viscosity grade of engine oil should be
selected based on the following recommendation and be
within the operating temperature shown in the engine oil
viscosity chart.
• SAE 5W-30 engine oil is preferred. SAE 5W-30 engine
oils improve low temperature starting and helps ve-
hicle fuel economy.
Lubricants which do not have both, the engine oil certi-
fication mark and the correct SAE viscosity grade num-
ber should not be used.
254 MAINTAINING YOUR VEHICLE