See also:

Four wheel drive (4WD)
Engine power can be delivered to all front and rear wheels for maximum traction. 4WD is useful when extra traction is required on road, such as, when driving on slippery, muddy, wet, or snow-cover ...

Lubricant specifications
Recommended lubricants To help achieve proper engine and powertrain performance and durability, use only lubricants of the proper quality. The correct lubricants also help promote engine efficiency ...

2011 Kia Optima Review
The previous generation Kia Optima was a vehicle struggling to keep up with the times, having emerged on the scene as a lackluster model masquerading as a value proposition, when in reality it was ...