I live in Dallas, and this is my first gas engine vehicle in a while. My diesel truck ran a 5w40 year round, which I felt very comfortable with.
My 04 naturally aspirated Forester [with 103k miles on the clock] runs 5w30 right now, which the Owner's Manual says is OK right up to about 95*. Being as this is TX and it does get a little warmer, what is a better weight oil to run? Is 10w30 enough or should a 10w40 be better for this climate for the summer?
I will just be running dino oil, so I don't want to start a discussion of the best oil brand to use. I am more worried about the weight, and I will be running Castrol or Valvoline or Pennzoil or whatever is on sale at the store when I go to buy oil. I run a 4000 miles OCI or so. I would consider a high mileage oil, but the car doesn't use any oil that I can tell.
Seeing as the car has over 100k miles on it, should I bump the grade up to 10w40? Will I lose any economy running a 10w40 v. the 5w30?
My 04 naturally aspirated Forester [with 103k miles on the clock] runs 5w30 right now, which the Owner's Manual says is OK right up to about 95*. Being as this is TX and it does get a little warmer, what is a better weight oil to run? Is 10w30 enough or should a 10w40 be better for this climate for the summer?
I will just be running dino oil, so I don't want to start a discussion of the best oil brand to use. I am more worried about the weight, and I will be running Castrol or Valvoline or Pennzoil or whatever is on sale at the store when I go to buy oil. I run a 4000 miles OCI or so. I would consider a high mileage oil, but the car doesn't use any oil that I can tell.
Seeing as the car has over 100k miles on it, should I bump the grade up to 10w40? Will I lose any economy running a 10w40 v. the 5w30?