Well I decided to go with a 10w30 oil based on some replies on a previous post and wanting to try Amsoil I ordered a case of 10w30. I didn't realize Amsoil had different lines and they gave me a case of the XL line in 10w30. Should I run it or send it back ?. I see the upgraded 10w30 version has a bit better specs. I'm using this oil on car that will basically be a garage queen , run in warm weather months only (no winters), weekends only, perhaps 5,000 miles a year. At this rate it should go 6 months between oil changes, guessing ?. Any recommendations whether to use the XL version or the upgraded version of Amsoil. Please don't reply to use other brands of oil, I am just questioning the different Amsoil lines. thanks very much.