I have been reading this post with great interest.
Decided to go to API's website and found some interesting information on oil service classifications.
The surprising find was my BX2200 (2003) calls for CD or CC. API list those as obsolete and not suitable for engines manufactured after 1990 or 1994.
See below.
DIESEL ENGINES (Follow your vehicle manufacturer’s recommendations on oil performance levels)
Category Status Service
CJ-4 Current For high-speed four-stroke cycle diesel engines designed to meet 2010 model year on-highway and Tier 4 nonroad
exhaust emission standards as well as for previous model year diesel engines. These oils are formulated for use in all
applications with diesel fuels ranging in sulfur content up to 500 ppm (0.05% by weight). However, the use of these oils
with greater than 15 ppm (0.0015% by weight) sulfur fuel may impact exhaust aftertreatment system durability and/or
drain interval. CJ-4 oils are especially effective at sustaining emission control system durability where particulate filters
and other advanced aftertreatment systems are used. Optimum protection is provided for control of catalyst poisoning,
particulate filter blocking, engine wear, piston deposits, low- and high-temperature stability, soot handling properties,
oxidative thickening, foaming, and viscosity loss due to shear. API CJ-4 oils exceed the performance criteria of API CI-4
with CI-4 PLUS, CI-4, CH-4, CG-4 and CF-4 and can effectively lubricate engines calling for those API Service Categories.
When using CJ-4 oil with higher than 15 ppm sulfur fuel, consult the engine manufacturer for service interval.
CI-4 Current Introduced in 2002. For high-speed, four-stroke engines designed to meet 2004 exhaust emission standards implemented
in 2002. CI-4 oils are formulated to sustain engine durability where exhaust gas recirculation (EGR) is used and are
intended for use with diesel fuels ranging in sulfur content up to 0.5% weight. Can be used in place of CD, CE, CF-4,
CG-4, and CH-4 oils. Some CI-4 oils may also qualify for the CI-4 PLUS designation.
CH-4 Current Introduced in 1998. For high-speed, four-stroke engines designed to meet 1998 exhaust emission standards. CH-4 oils
are specifically compounded for use with diesel fuels ranging in sulfur content up to 0.5% weight. Can be used in place
of CD, CE, CF-4, and CG-4 oils.
CG-4 Obsolete OBSOLETE: Introduced in 1995. For severe duty, high-speed, four-stroke engines using fuel with less than 0.5% weight
sulfur. CG-4 oils are required for engines meeting 1994 emission standards. Can be used in place of CD, CE,
and CF-4 oils.
CF-4 Obsolete OBSOLETE: Introduced in 1990. For high-speed, four-stroke, naturally aspirated and turbocharged engines. Can be used
in place of CD and CE oils.
CF-2 Obsolete OBSOLETE: Introduced in 1994. For severe duty, two-stroke-cycle engines. Can be used in place of CD-II oils.
CF Obsolete OBSOLETE: Introduced in 1994. For off-road, indirect-injected and other diesel engines including those using fuel with
over 0.5% weight sulfur. Can be used in place of CD oils.
CE Obsolete CAUTION: Not suitable for use in most diesel-powered automotive engines built after 1994.
CD-II Obsolete CAUTION: Not suitable for use in most diesel-powered automotive engines built after 1994.
CD Obsolete CAUTION: Not suitable for use in most diesel-powered automotive engines built after 1994.
CC Obsolete CAUTION: Not suitable for use in most diesel-powered engines built after 1990.
CB Obsolete CAUTION: Not suitable for use in most diesel-powered engines built after 1961.
CA Obsolete CAUTION: Not suitable for use in most diesel-powered engines built after 1959.