As I said when they get back with me I would post the numbers for Mystik JT 8 Oil. Here is the information I got from the Mystik Folks. I am not sure where these numbers fall for most oils, but these seem pretty good.
Take care,
TPS
Mystik JT-8 Syn Blend 15W-40 (typical specs)
TBN 11.0
CA 1300
**Mg 1100
P 1200
Zn 1300
B N/A
Mo N/A
HTHS 4.0
NOACK 11.0% loss
Magnesium is a detergent / dispersant additive which leads to the
highest levels of TBN per unit of SASH (sulfated ash) which means you
get the optimum dose of acid fighting protection with less ash buildup.
High levels of ash are a function of detergent...Barium, Calcium,
Magnesium are the most often used detergent additives. Calcium is a low
cost, effective detergent but must be used in larger quantities to get
the same TBN / cleanliness results. Because a oil has a starting TBN of
12, 14 or 57 means very little, the question I would ask is what is the
TBN retention of the used oil after 10,000 or 15,000 miles of hard
highway hauling or many hours of extreme off-road construction work. The
TBN must last throughout the oil drain life and not be used up quickly.
That's the advantage to Mystik JT-8 15W-40 and 15W-50 they are
formulated to retain TBN (acid fighting performance) for the extent of
the oil drain interval.
API CJ-4 is the newest heavy duty oil specification that is required for
2007 model year trucks in conjunction with the EPA's On-Highway 2007
Exhaust Emission Standards that require a reduction in nitrogen oxide
and particulate matter, Mystik offers a high performance diesel engine
oils for both new and older diesel engines, Mystik JT-8 EMT 15W-40
(CJ-4).
If you have a mixed fleet of older and new equipment you do not have
to stock two different grades of oil, one for new engines and one for
older unites. The new Mystik JT-8 EMT is designed to be backwards
compatible. Meaning, if your older units call for API CH-4, CI-4 or
CI-Plus then the only crankcase oil you would need to stock would be the
Mystik JT-8 EMT.