Severe Driving Conditions
The following are from the owners manual. I don't think I fall into any of these. Maybe B or K from time to time, but not regularly. So I don't think I'll change my oil at the severe 5000 mile mark. What about you?
Severe driving conditions
A: Repeatedly driving short distances of less than 5 mi. (8 km) in normal temperature or
less than 10 mi. (16 km) in freezing temperature
B: Extensive engine idling or low speed driving for long distances
C: Driving on rough, dusty, muddy, unpaved, graveled or salt-spread roads
D: Driving in areas using salt or other corrosive materials or in very cold weather
E: Driving in the condition of inflowing sand or dust into engine
F: Driving in heavy traffic area
G: Driving on uphill, downhill, or mountain roads
H: Using for towing or camping, and driving with loads on the roof
I: Driving as a patrol car, taxi, other commercial use of vehicle towing
J: Frequently driving under high speed or rapid acceleration/deceleration
K: Frequently driving in stop-and-go conditions
L: Engine oil usage which is not recommended (Mineral type, Semi-synthetic, Lower
grade spec, etc.)