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Old 07-06-2014, 04:43 PM   #1
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Synthetic Oil

Asking for suggestions, I have a 2000 class c with V10 triton engine it has 42,000 miles on it. I have only had it a short time and it is about do for a oil change.I have no idea what type oil was put in by the last owner. I am wanting to run a 100% Mobile one Synthetic oil. But can't make up my mind weather to run 5W20 or 5W30. Leaving in Aug for about a 1800 mile trip.
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Old 07-06-2014, 04:55 PM   #2
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I believe Ford says 5-20 . In synthetic.
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Old 07-06-2014, 09:20 PM   #3
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I agree. I often read about lubrication on the best website there is: BobIsTheOilGuy.com.

There's a difference between Mobil 1 oils, and the Mobil 1 EP is a far superior oil to just plain Mobil 1.

I just put it in my Yamaha 150 hp outboard motor.
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Old 07-07-2014, 09:40 AM   #4
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I'm a big believer in full-synthetic oil! I think it's well worth the extra cost to extend the life of the engine. JMHO!
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Old 07-07-2014, 05:36 PM   #5
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I use Mobile One 5w-30 in my V10.
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Old 07-07-2014, 05:39 PM   #6
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Quote:
Originally Posted by cwit View Post
I believe Ford says 5-20 . In synthetic.

Yes they do. I used it in both of mine.
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Old 07-07-2014, 05:44 PM   #7
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Yes they do. I used it in both of mine.
X2 Never run anything but 5w20 in a V-10. They are great, nearly bulletproof engines but Ford insists on 5W20.
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Old 07-07-2014, 05:56 PM   #8
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Look at the reviews that the Shell Rotella T6 is getting. I've been using it in every motor I own. It's a full synth, comes in 5-40 which is good for the hot summer months when I'm using it the most. I also use WIX filters. there's a lot of good info out there on the manufacturing and performance of the different filter manufacturers and if you're concerned about oil, the filter should be right up there on your list of things to look into.
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Old 07-08-2014, 10:42 PM   #9
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I use the Rotella T6 5W-40 in my diesel (it is a heavy duty diesel oil BTW). But for the Ford V-10 gas engine the 5W-20 (passenger car motor oil) is what is spec'd. A synthetic 5W-20 is a great choice, any brand will be fine. If you run in real hot weather you can probably go to 5W-30, but 5W-20 is still fine. The engine is designed with clearances for the thinner oil.
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Old 07-09-2014, 04:58 AM   #10
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I use the Rotella T6 5W-40 in my diesel (it is a heavy duty diesel oil BTW).
It's rated for diesels, it's not formulated JUST for diesels.....
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Old 07-09-2014, 11:04 PM   #11
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Quote:
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It's rated for diesels, it's not formulated JUST for diesels.....
I know, as I use the diesel oil in many of my old cars with gas engines. Diesel oil has a different additive package that can be beneficial in an older engine. But the Ford V-10 gas engine does not need the diesel oil, especially with the viscosity being higher. The new engines are designed to use the thinner oil and thicker oil can mess up some of the operational and oil cooling characteristics. Not sure if the V-10 has adjustable cam timing, but Ford cam phasers are well known for not liking thicker oil as one example. Also many new engines have oil squirters for piston cooling and these are designed for the thinner oils.

Without getting into major oil theory discussions, go to Used Oil Analysis - Bob is the Oil Guy - Bob is the Oil Guy and you will find more info than you could ever want to learn.
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Old 07-10-2014, 05:03 AM   #12
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It seems that any forum that has reference to combustion motors have generous amount of "oil threads"and Bob's site is almost always referenced so I've read enough about oil to last a life time. I like Shell products and run their fuel as often as I can. I keep all three Rotellas on hand depending on the service
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Old 07-10-2014, 05:07 AM   #13
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The difference between rotella & the 5/20 is the rotella is slightly more viscous.
You might get better fuel economy with the lower viscosity oil (all things equal)

If you have a fleet of vehicles, the rotella really makes life much easier if you change your own oil.
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Old 07-10-2014, 06:03 AM   #14
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All fuel economy ratings in modern vehicles are based on the lower rolling resistance of thinner oils. Go from a 5-30 to a 10-40 and they loose in the MPG race and raise their carbon footprint. Don't let the Prius guys hear that!
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