Romp question
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Senior User
Joined: Jan 2010
Posts: 269
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The viscosity of the oil when cold is what helps or hinders the injectors. The "5" in the 5/40 is what makes all of the difference. Effectively, it is a 5w oil until it begins to warm up and it slowly becomes a 40W as it continues to reach FOT.
A "10" W would obviously bridge the gap, but it might be "close and yet no cigar".
I would try the 5/40 T6 for this winter at a minimum. You may find you'll run it all the time. The injectors in this 7.3 are noticeably quieter with the 5/40.
A "10" W would obviously bridge the gap, but it might be "close and yet no cigar".
I would try the 5/40 T6 for this winter at a minimum. You may find you'll run it all the time. The injectors in this 7.3 are noticeably quieter with the 5/40.
Posting Guru
Joined: Sep 2014
Posts: 2,404
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From: Asheville-where weird is
Same as here right now. It is seasonal. Every year I plan to stock up during the summer and then fail to do it. I just stop at every WM I see while traveling until I find it after I wait too long.
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
I'm a big fan of Mobile 1, and Delo is a nice product as well. Just look for the CJ-4 rating on the oil - there are many flavors. Rotella T6 is the bargain basement "synthetic".
DieselDenny - My Gawd man. I flash my tool and this is what you see?
DieselDenny - My Gawd man. I flash my tool and this is what you see?
Cargo Master
Joined: Jul 2011
Posts: 2,674
Likes: 975
From: Walpole, MA
T5 is CJ-4 rated, which means it is a diesel rated oil.
http://www.farleycompany.com/pdf/dat...-30_(CJ-4).pdf
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