Oil question
Elder User
Joined: Feb 2009
Posts: 649
Likes: 2
From: PA
This is one of those questions that has a tendency to get certain people rowled up. Some guys on here run 15w40 some say switch to 5w40 and your truck will love you for it, and others on this site and others swear by 10w30 year round.
From all of the oil analysis' that I have studied 10w30 definitely has the best numbers, that is why I switched to Rotella t5 10w30 this weekend. In our engines 40 weight quickly shears to 30 weight where it stabilizes so running 30 weight is not going to hurt anything. In my opinion find out what your truck likes and run it.
From all of the oil analysis' that I have studied 10w30 definitely has the best numbers, that is why I switched to Rotella t5 10w30 this weekend. In our engines 40 weight quickly shears to 30 weight where it stabilizes so running 30 weight is not going to hurt anything. In my opinion find out what your truck likes and run it.
Posting Guru
Joined: Apr 2008
Posts: 2,392
Likes: 1
From: Green Lane, Pa.
I wish Ford would market their Motorcraft in 10W-30 like they do the 15W-40 in 5 quart containers, as far as I know Motorcraft is sold in 1 qt. containers. All the analysis I ever got back from Blackstone labs showed my Rotella 5W-40 sheared to 30W.
Fleet Owner
Joined: Nov 2003
Posts: 27,916
Likes: 3,635
FYI
From Ford:
10W30 - recommended operating range (ambient temps): 0*F to 50*F
5W40 - recommended operating range (ambient temps): -20*F to over 100*F
Also, I go up to 6000 miles between oil changes and my 5W40 is still in the 40wt range (low end I will admit, but still in the range).
From Ford:
10W30 - recommended operating range (ambient temps): 0*F to 50*F
5W40 - recommended operating range (ambient temps): -20*F to over 100*F
Also, I go up to 6000 miles between oil changes and my 5W40 is still in the 40wt range (low end I will admit, but still in the range).
Posting Guru
Joined: Apr 2008
Posts: 2,392
Likes: 1
From: Green Lane, Pa.
FYI
From Ford:
10W30 - recommended operating range (ambient temps): 0*F to 50*F
5W40 - recommended operating range (ambient temps): -20*F to over 100*F
Also, I go up to 6000 miles between oil changes and my 5W40 is still in the 40wt range (low end I will admit, but still in the range).
From Ford:
10W30 - recommended operating range (ambient temps): 0*F to 50*F
5W40 - recommended operating range (ambient temps): -20*F to over 100*F
Also, I go up to 6000 miles between oil changes and my 5W40 is still in the 40wt range (low end I will admit, but still in the range).
This is what I am reading from my owners manual,
10W-30 is good for -10 to 90 F.
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Junior User
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From: NJ
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Fleet Owner
Joined: Nov 2003
Posts: 27,916
Likes: 3,635
The Ford product data sheet below states 0*F to 50*F
SAE 10W-30 Super Duty Diesel Motor Oil
Motorcraft® SAE 10W-30 Super Duty Motor Oil is recommended for use in 7.3L, 6.4L and 6.0L Powerstroke® diesel engines from 0 °F (-18 °C) to 50 °F (10 °C) and 6.7L Powerstroke® diesel engines above 0 °F (-18 °C)
Also - in this video:
http://www.motorcraftservice.com/vdi...are/index.html
Fleet Owner
Joined: Nov 2003
Posts: 27,916
Likes: 3,635
I am also considering adding some ZDDP to the T6 next oil change - just as an experiment.
Senior User
Joined: Nov 2010
Posts: 172
Likes: 0
From: wildwood, mo.
What is ZDDP and what is it supposed to do?
5th Wheeling
Joined: Oct 2010
Posts: 46
Likes: 0
From: Upta Camp, Maine
