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  #1  
Old 12-31-2010, 11:20 AM
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Default M1 0w20 AFE in 09 4.7?

I am coming up on my first oil change on my 09 (my first, not THE first ) at 45000 miles, and I was wondering about trying something. But first some background. I know these are 2 totally different vehicles, so bear with me.

My 2006 Honda Civic EX called for 5w20, we ran Mobil 1 0w20 just fine. in fact it yielded about 3mpg compared to just M1 15w20. I did several wear tests, there was no leakdown or blow-by, no smoke or rattles or any kind of knocking from the engine. M1 says it fully compatible for use in anything reccomending 5w-20, and having used it before I am thinking about trying it. Trouble is, a small import 4 cylinder is a very different animal from a lumbering beast of an american V8, and while not the largest V8 in the world, I would imagine its wear characteristics are different from a Honda 1.8L.

That said, the only difference between 0w20 synthetic and 5w20 synthetic is its weight at room temperature. At operating temperature it is still a 20 weight which is whats reccomended for the 4.7L V8. I called the dealer and spoke to their lead tech. He said of course, that any deviation from 5w-20 would void my Chrysler Maximum care lifetime powertrain warranty (purchased with the truck) So lets hear ya'lls thoughts. I know 0w-20 is safe to run in most things 5w20, but has anyone tried it in this application?
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Old 01-05-2011, 09:11 AM
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Using lighter oil won't void the entire warranty, but it would technically void the warranty on the internals of the engine. That being said, I have never seen oil analyzed for viscosity BUT keep in mind that they may ask for proof of oil changes such as your receipts for the oil and filter if you do the work yourself and that would likely show the weight of the oil you used. Given the fact there is no guarantee that you'll see any mileage increase, it may not be worth the risk. In fact given the fact that both oils are the same viscosity at operating temps, I don't see how mileage would increase at all except from the time of a cold start to the point that the oil hits operating temp.
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Old 01-08-2011, 05:01 PM
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Having done the research further into the topic, I decided that the MPG increase that I saw was due to going from conventional oil to synthetic and not nessecarily from changing from 5w-20 to 0w20. Being that here there is a $2/quart difference, I just stuck with M1 5w20. Engine runs ALOT smoother and seems to be doing better on fuel too, though its not as noticable with a 26 gallon as it was with an 11.
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Old 07-15-2011, 11:44 AM
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Just FYI: I found this in My Amsoil Literature. This is an excerpt from a page on Warrantees. It is Amsoil document G2488 dated 04/09 Hope it helps.

"Automakers cannot deny warranty claims solely on
the basis of using synthetic motor oil, and they cannot
specify a certain oil brand to be used in their vehicles.
Instead, they require the oil meets the appropriate API performance
classification and SAE viscosity grade specified
in the owner’s manual.
“Installation or the use of special materials does
not, in and of itself, void the New Vehicle Limited
Warranties.”
Service and Parts Operations,
Chrysler Corporation"
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Old 02-10-2012, 08:20 AM
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I have been running M1 0w20 for about a month now, no fuel economy changes. I got it on sale, it was the same price as the 5w20. This engine, for whatever reason, likes 5w-20 better, so I wont be wasting the money on it anymore.
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Old 02-10-2012, 08:50 AM
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AOO, what mpg do you get? We basically have the same truck with same mileage etc....and I think you have a diablo? I have a superchips. I was using M1 extended performance 5w20 but recently switched to amsoil OE 5w20 because I get a deal on it now. I get around 17city/20-23hwy depending on speed. That's with the 93 SC tune.
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Old 02-10-2012, 08:51 AM
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Oh just realized your a 4x4. Otherwise basically the same lol.
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Old 02-10-2012, 02:36 PM
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I avg 14-16 in town and 22 steady on the hwy...if i dont have a facking headwind.

If I get a headwind or a mostly headwind crosswind, forget it, 17 or less all day on the freeway. Most times though I am over 20. Coming across South Dakota from NY to WA I was getting 24, but I think we had a badass tailwind.

I get 14-16 in town because it takes alot more energy to move a 4x4 around town. Thats why you get 17. lol.
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Old 02-10-2012, 02:40 PM
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Sounds reasonable. Also here in FL it's all flaaaaaaaat no hills...
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