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Originally Posted by hawthorne90250
Costco is selling 10-40W Mobile 1 with the CF designator, do i need 5-40W in a climate like Los Angeles or would even a 10-30W do in this climate as long as it had the CF
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I didn't know they had a 10W40 synthetic?
http://www.mobil1.com/USA-English/MotorOil/Oils/Mobil_1.aspx
Are you sure its not Mobil petro oil?
You should take a look at the manual, but I think 10W30 is going to be too thin for LA in the summer. Hopefully the new 5W40 will turn up soon.