According to the manual :
( page 441 )
Engine Oil Viscosity (SAE Grade) - 3.3L & 3.8L Gasoline Engines
SAE 5W-20 engine oil is recommended for all operating temperatures. This engine oil improves low temperature starting and vehicle fuel economy. Your engine oil filler cap also shows the recommended engine oil viscosity for your vehicle.
For information on engine oil filler cap location, refer to the Engine Compartment illustration in this section. Lubricants which do not have both, the engine oil certification mark and the correct SAE viscosity grade number should not be used.
Engine Oil Viscosity (SAE Grade) - 4.0 Liter Engines
SAE 10W-30 engine oil is preferred for all operating temperatures. The engine oil filler cap also shows the recommended engine oil viscosity for your vehicle.
Lubricants which DO NOT have both, the engine oil certification mark and the correct SAE viscosity grade number should not be used."
( page 444 )
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.
Materials Added to Engine Oil
The manufacture strongly recommends against the addition of any additives (other than leak detection dyes) to the engine oil. Engine oil is an engineered product and its
performance may be impaired by supplemental additives.
The 2008 Dodge Grand-Caravan has a V6 engine.
The 2008 Dodge Grand-Caravan has 12 valves.
The 2008 Dodge Grand-Caravan is a gas-powered vehicle.
The 2008 Dodge Grand-Caravan has overhead valves (OHV).
The 2008 Dodge Grand-Caravan's turning circle is 39.4 ft..
The curb weight of the 2008 Dodge Grand-Caravan is 4418 lbs..
The 2008 Dodge Grand-Caravan is 16 ft. 8.5 in. (200.5 in.) long.
The 2008 Dodge Grand-Caravan has a drag coefficient of 0.35 Cd.
The 2008 Dodge Grand-Caravan has a 4-speed shiftable automatic.
The 2008 Dodge Grand-Caravan runs on regular unleaded.
The front track of the 2008 Dodge Grand-Caravan is 5 ft. 3 in. (63 in.).
The 2008 Dodge Grand-Caravan has a 3 yr./ 36000 mi. basic warranty.