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6.7 Performance Parts Discussion 6.7 Performance Parts Discussion

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Old 05-20-2010, 07:47 AM
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Oil

Hey Guys,

What is the best oil and filter to use for the 6.7? I'm thinking royal purple or Mobil one. There are some manufacturers that make "special" diesel oil but I'm not sure what to use. Also I'm thinking 5w-40 should do the trick. no big hauls just yet for my truck.
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Old 05-20-2010, 08:24 PM
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I'd go with whatever Ford puts in em until there is more information...but i'm no expert
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Old 05-21-2010, 04:15 AM
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Just make sure its CJ4 compatable for the dpf.
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Old 05-21-2010, 07:38 PM
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Send a message via AIM to Abrannan19
I am planning to run the Valvoline EPB 5w40
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Old 05-22-2010, 01:01 PM
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I thought that Ford put something like 0w30 in the 6.7 motors. Isn't that the weight of the Motorcraft diesel synthetic oil?
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Old 05-22-2010, 03:35 PM
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I have a 6.4 and I use Amsoil and 15w-40. I changed to 5w-40 and my mileage lowered. I switched back to 15w-40 and gained almost two MPG. Go figure. Is this normal?
RJS
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Old 05-22-2010, 07:27 PM
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Quote:
Originally Posted by rondar View Post
I have a 6.4 and I use Amsoil and 15w-40. I changed to 5w-40 and my mileage lowered. I switched back to 15w-40 and gained almost two MPG. Go figure. Is this normal?
RJS
Had the opposite happen to me on my 6.4. I'm running Rotela T6 5w40. 15w40 was a killer for my mpg. But on the 6.7 I thought that they are calling for a 30wt oil.

Last edited by BlueF350; 06-14-2010 at 01:14 PM.
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Old 05-23-2010, 01:29 PM
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Use the Amsoil CJ-4.
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Old 05-27-2010, 07:50 AM
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So what is the Ford recommended oil for the 6.7? Is it 5w30?
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  #10  
Old 05-27-2010, 10:18 AM
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This is taken from page 42 of the 6.7 Diesel Supplement (referred to by the owners manual). The SAE 5W-40 API CJ-4 is recommended for severe duty. My question would be - is it advisable to use this over the 10W-30 API CJ-4 even if I classify my use as normal? (I suppose it would be a small price to pay for added protection)
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