diesel engine oil question
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Elder User
Joined: Dec 2001
Posts: 527
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From: Central WA USA
diesel engine oil question
I have read the specs for Mobil Delvac 1300 and for Shell Rotella T. It appears to me that Mobil has a higher TBN rating and higher flash point. This makes me believe that Mobil is the better oil, but most posts I have read point towards Rotella. Anyone care to chime in and explain to me what is better?
Logistics Pro
Joined: Jul 2002
Posts: 4,821
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From: South Dakota
diesel engine oil question
I don't think you're going to see any realworld advantage to either one, they are both excellent oils.
Personally I'd get whichever is cheaper and stick a good motorcraft filter on the sucker, and stick to the routine.
Goodluck!
Personally I'd get whichever is cheaper and stick a good motorcraft filter on the sucker, and stick to the routine.
Goodluck!
Posting Guru
Joined: Jul 2001
Posts: 1,914
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diesel engine oil question
Well, here is some food for thought. These are virgin oil analysis of the Delvac 15-40, Rotella t 15-40, and Delo 400 15-40, all are popular choices. Items listed are the ones with values otherwise values are zero or insignificant. All flash points are over 400F.
Delo 400
Magnesium 23
Calcium 3343
Zinc 1376
VIS@100c 15.95
TBN 10.63
Delvac
Moly 35
Boron 61
Calcium 2195
Magnesium 419
Phos 1120
Zinc 1231
VIS@ 100c 15.5
No TBN
Rotella T
Magnesium 20
Calcium 3322
Phos 1326
Zinc 1499
VIS@100c 15.12
TBN 10.36
If you like moly then the Delvac is the way to go. If you prefer a better base stock then the Delo is the better choice. The Delvac according to the package should not have a much better TBN then the others. The choice is yours- they are all good oils.
Delo 400
Magnesium 23
Calcium 3343
Zinc 1376
VIS@100c 15.95
TBN 10.63
Delvac
Moly 35
Boron 61
Calcium 2195
Magnesium 419
Phos 1120
Zinc 1231
VIS@ 100c 15.5
No TBN
Rotella T
Magnesium 20
Calcium 3322
Phos 1326
Zinc 1499
VIS@100c 15.12
TBN 10.36
If you like moly then the Delvac is the way to go. If you prefer a better base stock then the Delo is the better choice. The Delvac according to the package should not have a much better TBN then the others. The choice is yours- they are all good oils.
Junior User
Joined: Aug 2000
Posts: 69
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diesel engine oil question
Are there any silicon values on the VOA of these 3 brands?
If I'm not mistaken, that's the anti-foaming additive, definitely something you'd want to consider with the PSD's hydraulically actuated electronically controlled unit injectors.
I've seen VOA reports of Rotella T with 2ppm silicon, and Delo 400 0ppm silicon.
If it's not significant, what else is used to prevent foaming when used in high psi applications?
If I'm not mistaken, that's the anti-foaming additive, definitely something you'd want to consider with the PSD's hydraulically actuated electronically controlled unit injectors.
I've seen VOA reports of Rotella T with 2ppm silicon, and Delo 400 0ppm silicon.
If it's not significant, what else is used to prevent foaming when used in high psi applications?
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