The recommended oil weight for a 1999 Dodge Durango with a 5.2L engine depends on the climate where you live. Consult your owner's manual for the most accurate information, but generally,
10W-30 is a common and often recommended weight for this engine in moderate climates. In hotter climates, a
10W-40 might be better. In colder climates, a
5W-30 might be preferable.
Always check your owner's manual for the manufacturer's specific recommendation, as this will take into account the operating conditions and engine specifics.