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2019 f550 6.7 #5331615 01/25/20 07:49 AM
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ame299 Offline OP
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just got a new f550 6.7 have seen ford changed spec to synthetic and to 5w 40 for the f550 what is recommended I know has been talked about was wondering what others are using and like im thinking rotella or motorcraft want best oil for my hard working service truck.

Re: 2019 f550 6.7 [Re: ame299] #5331623 01/25/20 07:56 AM
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tundraotto Offline
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Just pick any 5W-40 synthetic HDEO, that meets the proper Ford spec and you will not have any oil related problems.

Re: 2019 f550 6.7 [Re: ame299] #5331676 01/25/20 08:59 AM
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mattd Offline
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Honestly, we run 15w40 in our 6.7s that see SEVERE service. The OLM comes up every month, 2000 road miles and probably around 400-450 total hours.

Last edited by mattd; 01/25/20 09:00 AM.

2007 Ford F-350 4x4 6.0 PSD

ASE Master, L1, L2
Re: 2019 f550 6.7 [Re: ame299] #5331687 01/25/20 09:14 AM
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tundraotto Offline
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Agree ^ I would also opt for the 15W-40 in severe service - if it has the proper certification, for warranty purposes. If not - I would stick with 5W-40 (with Ford spec)...after warranty period I would run a 15W-40 for sure.

Re: 2019 f550 6.7 [Re: tundraotto] #5331750 01/25/20 10:44 AM
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ame299 Offline OP
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was thinking the same any particular brand ? and is semi synthetic a good choice? we had some 2014 6.7 years ago we ran delo 15w40 in had no oil issues

Re: 2019 f550 6.7 [Re: ame299] #5331752 01/25/20 10:47 AM
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mattd Offline
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I prefer the CJ4 motorcraft.


2007 Ford F-350 4x4 6.0 PSD

ASE Master, L1, L2
Re: 2019 f550 6.7 [Re: ame299] #5331766 01/25/20 11:14 AM
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NH73 Offline
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I heard that these 6.7 has a ceramic coating in there turbos and that is why they took issues with the CK-4 oils. Yet, there were CJ-4 oils that were lower in there zinc or ZDDP that Ford never made an issue of.


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2004 Ford Explorer Sport Trac
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Re: 2019 f550 6.7 [Re: NH73] #5331770 01/25/20 11:17 AM
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mattd Offline
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Originally Posted by NH73
I heard that these 6.7 has a ceramic coating in there turbos and that is why they took issues with the CK-4 oils. Yet, there were CJ-4 oils that were lower in there zinc or ZDDP that Ford never made an issue of.


The big issues with the turbo in the pickups was the design.

They were concerned about valve train wear, specifically the rocker arms, with CK4 oils, not the turbos. The turbo in the pickups is different from the cab and chassis trucks.

The valve train is unique to the 6.7. 32 valves, 32 rocker arms, 32 pushrods, and a unique hydraulic lifter that utilizes 2 small hydraulic tappets in an oversize roller assembly.

Last edited by mattd; 01/25/20 11:20 AM.

2007 Ford F-350 4x4 6.0 PSD

ASE Master, L1, L2
Re: 2019 f550 6.7 [Re: ame299] #5331923 01/25/20 02:06 PM
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53' Stude Offline
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Mattd: thank you for all your great info smile

I enjoy your posts sir Cheers1 thumbsup


2009 Toyota Camry LE

161,669 miles

Valvoline Maxlife Synthetic 5w20 Dexos 1 Gen 2 SN+
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