what weight should I be using(summer driving only)?

 

what ever it says on your oil cap, if you have alot of miles on you car you can to the next weight.so if it says 5w -20 you can use 10w-30

 

A 0W-20, 5W-20, 0W-30 or a 10W-30 will work for your application. Just remember if you go to a xW-40 or xW-50...The heavier the oil weight, the harder it is for the oil to release the heat that it picks up from the internal parts (Cam bearing, rod bearing, wrist pins and so on). The lighter weight oilsrelease heat easier and faster, thus reduces internal operating temperatures better.