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I have a quick question.

My 2.3 Duratec has 99,900 miles, I was thinking of running a little thicker oil than the recommended 5w-20. The guy at Autozone told me to try 10w-30, but I think that might be a little thick, especially seeing as it's cold out up here now during winter. Those auto parts store guys don't know anything!

I was thinking 5w-30. If it matters, I run Mobil1 Full Synthetic, and I change it every 2500-3000 miles.

Any input?
 

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I run 20w50 in my Focus... Its not a Duratec but that really doesnt make any difference.
 

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You will not have any problems with 5w30. I think Ford just did that for some cold start-up fuel mileage thing, but 5w30 is just fine. I run that in M1 synthetic as well.
 

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The W stands for winter the thiner oil gives better gas mileage.
 

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All oil starts out at the higher number till it gets to operating temp and thins to the lower number.
 

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I have a quick question.

My 2.3 Duratec has 99,900 miles, I was thinking of running a little thicker oil than the recommended 5w-20. The guy at Autozone told me to try 10w-30, but I think that might be a little thick, especially seeing as it's cold out up here now during winter. Those auto parts store guys don't know anything!

I was thinking 5w-30. If it matters, I run Mobil1 Full Synthetic, and I change it every 2500-3000 miles.

Any input?
If it does not use any oil I would stay with the 5W20 Moble 1
 

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Actually the 5 indicates the viscosity when cold and the w20, w30, etc indicates the viscosity when fully warm....
 

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I am about where ur at mileage-wise, i have ran 5w20 mobil1 and am running 5w30 mobile 1..... Only thing i can notice is mpg difference. I also change fluids about 5k miles. Like i said minor mpg difference, but beat the piss
out of it so more viscosity = peace of mind.
 

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Stay with the Mobil 1 5W20.

The 5W20 flows like a 5 weight when the oil is cold and breaks down like a 20 weight would when it is hot.

Jeff
 

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I switched from 10w-30 to 5w-20 and noticed a very nice increase in mpg.

I was running 10w-30 because I had a very limited selection. :/
 

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I'm running 15w40 in my turbocharged duratec. I doubt it's gonna make that big of a difference.
 

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Mobil 1 makes a high-mileage 5w30/10w30/etc and its the same price as regular.

For what its worth I run 10w30 because I have built and beat on it.
 

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There really isn't any reason to use anything other than manufacturer recommended oil unless you are heavily modded or burning oil.
 

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I have used synthetic 5W20 in our Focus since the first oil change at 500 miles.
This time, I filled the filter with 5W30, put some Marvel Mystery Oil in the crankcase, and filled the rest with 5W20. I run between 6 and 7K OCI, with an analysis once a year (by Blackstone Labs) with no issues whatsoever.
 

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There really isn't any reason to use anything other than manufacturer recommended oil unless you are heavily modded or burning oil.
True that. My 03 focus died in a wreck with 166k miles on the odometer and it saw nothing but 5w20 every 5k miles and never burned a drop of oil.

The 2010 will have oil changes every 7500mi with regular motocraft and I'm sure the engine will outlast the body.

Granted now i drive like like an old lady 90% of the time but it's because the company pays mileage and it's not worth burning the extra gas to go fast. lol
 

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From last I was told, the thinner oil is due to closer mechanical tolerances. I'd stick with the 5-20 same price anyhow.
My 06 freestyle uses the same in its 3.0 Duratec, no issues either
 
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