Hello all, just wandering about oil for the Yukon. I have been using M1 5w-30, but I have seen the red capped M1 15w-50. I live in SE Alabama and in summer we get approx. 90-100 degrees and in the worst winter maybe a week or two in the low 20's. Is the 15w okay for me to use?

 

15w50 motor oil means that at 32 degrees the oil has the properties of a 15 weight oil and at 200 degrees has the characteristics of a 50 weight oil

 

Personally, and this is just my opinion, I'd stick with the 5w for a couple of reasons. First, that is what the manufacturer recommends, and second, the first number is what the oil's characteristics are cold. Once the oil heats up to a certain temperature, it takes on the characteristics of a 30 weight oil. But that's just me.

Just realized that you were considering 15w-50, I was thinking 15w-30. I definitely don't see any reason you'd need a 50 weight unless your engine is on it's last leg or you've got some major HP and are taking it to the extremes. Once again, just ny opinion.

 

i would run either 5 w 30 or 10 w 30 their is no reason for you to run 15w 50 IMO.

 

10w30 here in southern cali

 

The manufacturer recommends 5w-30 for gas mileage reasons, nothing else. You can run a 15w50, but it is a little unnecessary. In your climate, you should run a 5w30, 10w30, etc. in my opinion.
Ryan

 

10w30 M1 - here

 

I did alot of reading up on the subject before I made the jump to synthetic. I went with Mobil 1 0W40 2 days ago. I think the Mobil 1 10W30 thins out to a 20W in our motors. Do a search for oil or for our resident oil guru, Patman.

 

same.

 

5w30 Mobil 1 here in N.C. Still have 45 psi of oil pressure at operating temp year round.