Oil viscosity - Ford Powerstroke Diesel Forum
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Old 05-11-2013, 04:03 PM
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Oil viscosity

I pull a 10k fifth wheel about 3 times a month. The ford dealership says all I need to 10w30 oil. They do not stock the 5w40. Should i use the 10w30 or use 5w40 in something like Rotella t6, Delo le 400 or maybe amsoil?
I plan on keeping this truck a long time and want to get the maxium mileage out of it.
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Old 05-11-2013, 04:10 PM
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Quote:
Originally Posted by Grizzly460 View Post
I pull a 10k fifth wheel about 3 times a month. The ford dealership says all I need to 10w30 oil. They do not stock the 5w40. Should i use the 10w30 or use 5w40 in something like Rotella t6, Delo le 400 or maybe amsoil?
I plan on keeping this truck a long time and want to get the maxium mileage out of it.
Diesels in General

I sure like the lower viscosity for the winters or even cool weather

I also like a higher viscosity for Towing

I am sure the 10-30 is ok but I would rather do the T6 or Delo 5-40 year round

I don't like Amsoil because I don't want to mail order My oil
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Old 05-11-2013, 05:51 PM
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my dealer says the same thing,i was looking for cj-4 rated 10w30 and could not find it. the generic ford 10w30 can't be the best out there can it? I ran 5w40 rotella t6 year round even though I don't tow much in my 6.4,but according to ford short city drives is extreme duty, the same as pulling heavy so I don't know. i'm still in break in the 6.7 so I would like to know too. the synthetic handles more heat so I would think it would at least save the turbo bearings. sorry for the long winded subscribed!!
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Old 05-11-2013, 06:51 PM
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I just use Shell Rotella T 15w40. Put it in every diesel Ive owned, never had any problems. Cheap at walmart too.
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Old 05-12-2013, 08:20 PM
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FWIW ,i'm switching to t6 5-40 after the break in. I read the manual and everytime it mentions anything outside of the norm,pulling ,higher grade bio over 5% etc it calls for 5-40. I would rather over do it when it comes to oil!! and besides i'm in Canada and up north where it can be +30c one day and cold the next (had snow in june once) and 5-40 is good for all temps.
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Old 05-13-2013, 09:12 AM
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Raftdaddy has it right. Here's the definition of "severe service operation" from p. 51 of the Diesel Supplement:
Engine lubrication for severe service operation

The following conditions define severe operation for which engine operation with SAE 5W-40 API CJ-4 is recommended. Oil and oil filter change intervals will be determined by the Intelligent Oil Life MonitorTM as noted previously.
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 -10F (-23C) or above 100F (38C)
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)
use of high-sulfur diesel fuel
It sounds like you likely should be using a 5W-40 oil.
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Old 05-29-2013, 04:05 PM
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Yea, got it changed at ford dealership and used motorcdraft 5w40. I ask service tecj how many quarts he put in and he said 13. I plled fifteh wheel about 200 miles and check oil. Way too full. I went back to dealership and the service tech said he put in 3 jugs. Well that is 15 quarts. They drained some out and said good to go I got home and cjeck it again and it was still too full. I trained about 1 1/2 quarts. Looks like I will just do oil changes myself. It seems like they do not know how much oil the 6.7 holds.

Has anyone else had this problem
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Old 05-29-2013, 04:19 PM
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Sorry to hear that, mine goes in next Thursday ill let you know how mine goes. If ford synthetic or Dino??
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Old 05-29-2013, 04:49 PM
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Originally Posted by raftdaddy View Post
Sorry to hear that, mine goes in next Thursday ill let you know how mine goes. If ford synthetic or Dino??
I hope yours goes better than mine!
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Old 05-29-2013, 06:27 PM
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The first oil change on my 6.7 for the stealership made me never want to go back to them. They left the dipstick laying across the block and I blew out 3 qts on my way to visit the inlaws. From then on I always check everything after they work on it.
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