Oil type
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Senior User
Joined: Jan 2012
Posts: 142
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From: Richmond MI
Oil type
Had my oil changed at the dealership yesterday. Work receipt showed they put in 10-30W in my 6.4L. Manual shows it being acceptable, but preferred is 15-40W. Stick with 10-30W or ask why they did not use 15-40W?
Cargo Master
Joined: Jul 2011
Posts: 2,675
Likes: 979
From: Walpole, MA
I could be wrong but don't 6.4 come from the factory with 10w-30 or is that just the 6.7. Probably cause they had more 10w-30 in stock and that is the preferred general oil for the new truck and just figured if it is good enough for the new one...it is good enough for the 6.4?
On BITOG there are a lot of good looking UOAs from CJ4 10w-30 oils so I would not worry.
On BITOG there are a lot of good looking UOAs from CJ4 10w-30 oils so I would not worry.
Super Moderator
Joined: Aug 2008
Posts: 37,384
Likes: 1,867
From: Frederick, MD
I could be wrong but don't 6.4 come from the factory with 10w-30 or is that just the 6.7. Probably cause they had more 10w-30 in stock and that is the preferred general oil for the new truck and just figured if it is good enough for the new one...it is good enough for the 6.4?
On BITOG there are a lot of good looking UOAs from CJ4 10w-30 oils so I would not worry.
On BITOG there are a lot of good looking UOAs from CJ4 10w-30 oils so I would not worry.
Cargo Master
Joined: Jul 2011
Posts: 2,675
Likes: 979
From: Walpole, MA
Well there you have it.
Regardless, I wouldn't worry too much about a 10w-30, especially in your climate this time of year.
Regardless, I wouldn't worry too much about a 10w-30, especially in your climate this time of year.
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More Turbo
Joined: Sep 2007
Posts: 525
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From: Centerbrook, Ct.
BTW- I use the Shell Rotella T6 synthetic 5W 40 year round. Probably a little over kill at 5K oil changes, but it's always clean and seems to flow well in winter and still keep the engine cool & well lubed in the summer heat. Yes, the 10W 30 is acceptable, but why bother with it when 5W 40 is good ALL the time and covers the greatest temp range? I would still ask the dealership their logic on the 10W 30
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Cargo Master
Joined: Jul 2011
Posts: 2,675
Likes: 979
From: Walpole, MA
BTW- I use the Shell Rotella T6 synthetic 5W 40 year round. Probably a little over kill at 5K oil changes, but it's always clean and seems to flow well in winter and still keep the engine cool & well lubed in the summer heat. Yes, the 10W 30 is acceptable, but why bother with it when 5W 40 is good ALL the time and covers the greatest temp range? I would still ask the dealership their logic on the 10W 30
More Turbo
Joined: Sep 2007
Posts: 525
Likes: 8
From: Centerbrook, Ct.
I don't remember exactly. I think it's about $21. a gal. for the Rotella T6 at Walmart (probably about twice as much as 15W 40 Dino oil). I haven't priced any 10W 30 oil, so I don't know the difference in cost. To me, it's still cheap insurance to keep my engine in top shape.
Cargo Master
Joined: Jul 2011
Posts: 2,675
Likes: 979
From: Walpole, MA
I don't remember exactly. I think it's about $21. a gal. for the Rotella T6 at Walmart (probably about twice as much as 15W 40 Dino oil). I haven't priced any 10W 30 oil, so I don't know the difference in cost. To me, it's still cheap insurance to keep my engine in top shape.
a bit.Back on point, they polly threw the 10w-30 in there cause it is the spec'd fluid for a 6.7, FoMoCo says its kosher to run in a 6.4 and more and more 6.0's are getting filled with it cause of customers complaining of cold start issues.
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