What weight engine oil do u guys use? I live in upper mich should I run a different weight oil in winter then summer?.....does it have to b motocraft...some one told me that the 6.0 needed to have motorcraft oil due to an additive...thanks

 

I don't see why a quality multiweight would not work just fine. I believe Ford recommends a 10W30 in the 6.7L but they also specify a 5W40 as well as a 0W40. Obviously the 5W and 0W have lower pour points and would flow better at low temps.

If you use a block heater when it gets cold I am not sure it would matter much whether you used the 10W30 or the 5W/0W-40.

---Aaron

 

I run Rotella T6 5W40 in mine.

Thanks

 

Been running 10w30 in the colder months, 15w40 in the warmer months. I just might make the switch to the 5w40 though and have the peace of mind knowing I'm covered for any condition.

 

From what I've read, 10w30 will work fine for general use down to around -10*F.

For severe duty, you'll want to run a 5w-40. What is severe duty?

• frequent or extended idling (over 10 minutes per hour of normal
driving)
• low-speed operation/stationary use
• if vehicle is operated in sustained ambient temperatures below -10°F
(-23°C) or above 100°F (38°C)
• frequent low-speed operation, consistent heavy traffic less than
25 mph (40 km/h)
• operating in severe dust conditions
• operating the vehicle off road
• towing a trailer over 1,000 miles (1,600 km)
• sustained, high-speed driving at Gross Vehicle Weight Rating
(maximum loaded weight for vehicle operation)
• use of fuels with sulfur content other than ultra-low sulfur diesel
(ULSD)

If you are looking at extreme arctic conditions (say, -30*F or beyond), you'll probably want to run a 0w40. Just because, at that temperature, even a 5w40 is going to have trouble. I wouldn't run it all the time though, as it breaks down faster than a typical 5w40 and it's more expensive.


On a side note, what ever you do decide to run, make sure it meets CJ-4 specifications for a modern diesel.

 

Rotella T6 5W 40........

 

Diddo

 

motorcraft... but Im sure any kind will work.

 

I run a good full synthetic 5W-40 year round simply because of the temperature range. But the last couple of winters have got as cold as the used to so I am wondering if it makes that much of a difference. I have been thinking of going to the 10W-30.

 

Guys, the 5w40 is better in winter and still protects like a 40 weight in operating temps. A conventional 10w30 is going to have poorer pour characteristics than a synthetic 5w40. 0w40 are now available for extreme cold starting. Still 40 weight towing and hauling protection. Remember the block heater does not heat any oil, so if you are using non syn oils, an engine oil pan heater is a good idea below -10 F. Kept you are running Dino 10w30 or especially 15w40, a oil pan heater and block heater will be a good idea. I start at as cold as -45 C even if I can't plug in block heater with 5w40 syn. No way in heck a 10w30 Dino would start as HPOP would be blown wide open. I know your 6.7 don't have an HPOP to worry about but no oil in bearings on cold start does much damage eventually..... Be careful to go by the manual as well, 10w30 is not for towing or hauling unless below a certain temp.