Really depends on environment. 15W-40 is common as an "all around" oil for diesel engines, while 5W-40 might be more common in particularly cold environments.
15-40
According to the manual, the recommended weight is 5w30. I do not know if there is a recommended brand or not.
The recommended oil is SAE 5W-20
The same weight recommended in the owners manual.The same weight recommended in the owners manual.
No, not if the recommended weight is 5w30. Only use the weight recommended by the manufacture.
5w30
5w30 is recommended
You should use 5W30. That is the recommended weight.
10w30 weight.
Use SAE 5w-30 weight oil.
For a 2002 Kia Sportage the recommended oil to be used is a 10W-30. Most vehicles use this weight of oil. Depending on the climate it is best to stick with the recommended oil weight for your vehicle.
The recommended weight of oil for a 2003 Ford Econoline Van 6 cylinder is 5W20. It requires 6 quarts of oil.