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Old 10-11-2010, 08:32 AM
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Question Which is best oil?????

I have an 05 6.0l and I have all the normal problems. So, after reading tons of threads on how to make things better, I've seen that what oil you put in makes a difference. So then what is the best oil? 10W30 or 15W40 and should I use synthetic? Is there anything else I should add with the oil? Any help would be greatly appretiated.
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Old 10-11-2010, 02:08 PM
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Yes synthetics is a great choice. As for the type there are a bunch of choices and more opinions than you can shack a stick at. Use the search functions and start reading. Then make your own mind up.

I just changed mine with AMSOIL Series 3000 Synthetic 5W-30 Heavy-Duty Diesel Oil (HDD)

Interesting thread I started.
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Old 10-11-2010, 02:41 PM
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I use Schaeffer's fully synthetic motor oil, can't believe how smooth the engine runs.

Schaeffer Oil 3.0 | Industrial Lubricants | Diesel Fuel Additive | Synthetic Motor Oils
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Old 10-11-2010, 03:31 PM
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Valvoline premium blue extreme, rotela synthetic or mobile 1. fuc amsoil there stuff is over rated why pay more if u still have to change it at the same interval as the rest.
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Old 10-11-2010, 07:54 PM
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I am facing the same decision as I just got my truck a few weeks ago. Came across this website. Definitely helps direct someone to pick the proper weight with some recommendations for each weight. This isn't a sales site, just info and analysis.

Bob Is The Oil Guy
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Old 10-11-2010, 08:10 PM
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ive been using motorcraft 15w40 whats everyones opinion on that oil?
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Old 10-11-2010, 10:00 PM
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I started out with MotorCraft 15w40 and switched at 20k when i installed the Amsoil by-pass system and started useing Amsoil 15w40 just a few $$$$ more but i think it is well worth it because the injectors run in oil and they like clean oil. The Ford filter cleans to 20 microns and the by-pass cleans down to 2 microns
2 stroker
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Old 10-12-2010, 04:38 AM
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Where is the best place to buy oil? I've checked local auto parts stores and walmart but there is a slim selection? is there a cheaper place online to order it?
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Old 10-12-2010, 05:15 AM
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A lot of folks have been raving about the new Rotella T5 10w30. It available at Wally World at a reg. price of about $16/gal.

I prefer Amsoil myself and buy it online.
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Old 10-12-2010, 07:54 AM
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Valvoline premium blue extreme 5w-40 full syn gets my vote
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