I would just stick with the same oil you've been using.
Mobile One Synthetic for High Milage engines
No, it is not required. I do however recommend a high mileage formula conventional oil or you can if you wish use synthetic.
Some cars as well as aircrafts use synthetic oil. Whether you should use it in your car or not will depend on the age of the car as well as its milage. If its too old, its probably not a good idea.
High milage motor oil has extra additives which help prevent oil leaks.
The highway gas milage for a Dodge Dakota varies by vehicle. Average milage is around 16 mpg.
Several companies make a motor oil specifically for high mileage cars. Also a good synthetic oil might be just as good.
The gas milage of a sedan is 40 and the gas milage of a normal one is 25
Any ATF for automatic transmission or MTF for manual speaks for it self. If you upgrade all your fluids to Synthetic then you get better milage and car will run better, preform and last long time.
You need to use the most expensive stuff, which is unfortunate on your wallet, but fortunate for your engine. Use Mobil 1 synthetic 0W40. Thats not true. Depending on the milage of the saab, if it's new you can use a synthetic blend or full conventional (if your the risky type), and if it's over 50,000 miles use full synthetic or a synthetic blend with additives that help protect against sludge, which is a big problem with saabs.
WHAT IS THE MILAGE
Milage... The counter tracts milage ...about 8,000 kms from 100 % to 0 %
The service computer is pre-set for 10,000 mile oil change intervals(A service, B service). You can only get this milage using a synthetic engine oil. Also keep in mind new from the factory the engine has been serviced with a pure synthetic oil which is NOT compatible with a mineral based oil. Also all the engine seals are of a polymer rubber designed to withstand the chemical compound used in synthetic oils. I understand you are asking due to price of the oil, however considering you get 10,000 miles between changes, the engine is started with a lubricationg film still in place ( cylinder walls, bearing, etc..) which reduces the damaging impact cause during engine start, the synthetic oil is the way to go!! Use Mobil 1, you will be glad you did. My Benz, BMW and Porsche all use Mobil 1 as requested by the producer of the car. Edit: I'm not going to overwrite the nonsense above, I'll just correct SOME of it. For one thing, synthetics are compatible with conventional oils. Feel free to verify this on mobil1.com or valvoline.com: Mobil 1: "Mobil 1 is fully compatible with conventional motor oils, semi-synthetic motor oils and other synthetic motor oils, should it be necessary to mix them." Valvoline: "Switching between synthetic and conventional oil does not cause problems. Because the oils are compatible, you can switch back and forth as often as you like." Also note that some oils are "synthetic blend", which literally means a single product that is a mixture of conventional AND synthetic oil types. Not compatible? Yeah, uh... OK.