I use 0-30 with no problems....used it in other vehicles tooo...no problems..a lighter oil does have its benefits...since I take it your a hwy traveller,,the lighter wt should be a milage bennie.constant temps and loads no prolonged idling..no everyday stop and go....0 wt is fine ,just because the outside temps get over 100f does not mean your eng is hotter..just watch the temp gage..better yet get a oil temp gage and monitor it..Now if your a beater then you better get the right oil..maybe evn a 15-50...because your loading up the eng creating more heat and stress.
Warm ups are bad as it takes awhile to get the eng warm enough to burn off the moisture and what have you.Alll the while the eng is cold your getting blowby,which dirties the oil so much faster.Start it and go,it warms up much faster( unless of course you have a SS Auto- give it 30 secs for brake boost to stabilize).In the summer these cars warm up quickly..in winter..it takes a few miles..remote start is not so good sometimes,,,,thoght it does make the interior tolerable and gets the ice off).
Another note..recommended means for most drivers..not everybody drives their car the recommended way.For the average driver its fine..there are a few percents out there that fall outside this range one side or the other,,these people may need or consider alternate methods. So just because "you" follow the book to the "t" doesn't mean everybody else needs too.Note the "if the duty cycle is normal" part.

 

Hey Spririted driver,

I am a Redline fan too........but it is hard to find on the East Coast.

I had an oil analysis done once on 10w-30 that went nearly a year and 5000 miles in my 2000 Vette.

The letter came back stating that it was safe to re-install and reuse. It had a better TBN used than many mineral based oils do when new!

I think if you plan to keep the car a lot of years, the high price of Redline may be warranted.

QuickRick

 

You need to take a class on viscosity and its applications. Your in North Carolina. There is no logical reason to even run 5 wt in that area. The only place to consider a wt that low is is up in North Dakota and Minnesota. Many to include myself ran straight 5 wt in Alaska during the winter months


I've been to many parts of the world (Alaska) and have experienced and seen first hand how oil is effected by temperature. Book says this, someone says that based on assumption and no fact. Anyone ever see what 10-30 or 40 does when its 0 degrees or lower and especially if its not fresh oil and has engine deposits in it?

Well its like having 5 qts of "taffy" in your oil pan. This is why they make dipstick heaters

 

I would like to add that someone earlier said modern engines do not require warm up. Well I agree with that to a certain extent. But definatly do not get into a cold engine and hot rod it. The oil is thick and not pumped all up in the top end completly until it is warmed up.
I always get in the car start it up and go but never give it much gas until it is fully warmed up.
Chevrolet reccomends 5-30 so that is what I use but if I remember right 0-30 is also on the approved list someone had here. 0-30 could possibly get a little better mileage in a warm engine and should help in cold weather starts.