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  #1  
Old 11-16-2012, 04:57 AM
Alaskan Hemisport Alaskan Hemisport is offline
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Default which oil?

I'm about to do my forest oil change on my 03 4.7. It has over 140000 miles on it. Pretty sure it hasn't met regular maintenance from the previous owner. Which oil should I use for winter? Do any of the high mileage/sludge removed oils actually work? And does this take the same amount of oil as the 5.7?
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Old 11-16-2012, 09:39 AM
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Do you have an owner's manual? That would tell you oil viscosity and quantity. Pay attention to viscosity for your temp(since you are at an extreme).

You could use a high mileage oil or such, but I'd use seafoam to clean out the engine. I'd pour a can of seafoam in the oil with some cheap oil and cheap filter, run it about 250-500 miles, then change the oil and filter again to the oil you want to use.
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Old 11-16-2012, 10:22 AM
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Oil capacity for the 4.7 is 6 quarts with a filter change.
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Old 11-16-2012, 01:51 PM
Alaskan Hemisport Alaskan Hemisport is offline
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The truck didn't come with a manual so that's why I wanted to make sure. So with the seafood I just do a oil change like normal, then dump a whole can of seafoam in where I put the oil in along with 6quarts and run it? Does this do the same as pouring it in the mac line or does it hit areas the other way doesn't reach?
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Old 11-16-2012, 01:57 PM
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I'm not 100% positive on the early 4.7 but the later runs 5w20. I think my dad's 05 calls for 5w30. Also your temperature has a role in that too.

LOL seafoam, not seafood! Don't put sushi in your engine!

Don't overfill the oil, whatever amount you put in of seafoam REPLACES that amount of oil. So you will still have 6 qts total. Adding it to the oil is different than the vacuum line, it will clean the crankcase out. Through the vacuum line will clean the intake out. Putting it in your gas tank will clean your fuel injection system.
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Old 11-16-2012, 02:25 PM
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Gotcha. Also, stupid autocorrect lol. I want to try it I just worry about the seafood harming the motor. I READ some where that if you do it wrong you can hydrolock it, but I think that only implies to pouring it into the vac system.
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Old 11-16-2012, 02:25 PM
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yeah you should be fine.
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Old 12-24-2012, 12:28 PM
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I use high mileage synthetic oil. 155,000 miles on mine 30W but I do live in the south! Depends on where you live I guess, does not get that cold down here, I can run the same 30W all yr long
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Old 01-10-2013, 11:59 PM
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Default Full Syn 5w20

I've been using full synthetic Mobil-1 5w20. Fairly expensive, but if you poll the experienced mechanics here and other places who have the 4.7 it seems like that is what many of them use.

Synthetics are obviously the best choice, and the reason that I use 20 (instead of 30) is that it just seems like on an older engine like mine (10 year old 4.7 with 108k) it would be best to get the 'lighter' oil to the top of the engine as soon as possible. But that's just my opinion and I have been wrong before...
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Old 01-11-2013, 12:16 AM
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snrusnak snrusnak is offline
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Quote:
I've been using full synthetic Mobil-1 5w20. Fairly expensive, but if you poll the experienced mechanics here and other places who have the 4.7 it seems like that is what many of them use.

Synthetics are obviously the best choice, and the reason that I use 20 (instead of 30) is that it just seems like on an older engine like mine (10 year old 4.7 with 108k) it would be best to get the 'lighter' oil to the top of the engine as soon as possible. But that's just my opinion and I have been wrong before...
Typically you go to a thicker oil with age to "fill in" since the engine wears. But 10w30 and 10w40 are both 10 weight and both will work.
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