It depends on the temp if it gets over 100F than 10 w30 if it rarely gets over 100F than 5w 30. this is what it said in the manuels you buy that are like 500 pages and 3 inces thick. also if the car has over 50,000 miles use conventional oil not synthtic. the reason for this is if you start to use syn you may have an oil leak appear.