SAE 15W-40
Diesel Engine Oil 15W-40 CK-4
The mainstream heavy duty fill for mixed on- and off-highway fleets running CK-4, with full backward compatibility to CJ-4 and CI-4 Plus.
API CK-4, CJ-4, CI-4 Plus, CI-4, CH-4API SNACEA E11, E7
Truck, Tractor & Earthmoving
Heavy Duty Diesel Engine Oil
Built for duty cycles measured in hours, not kilometres. Soot handling, TBN retention and aftertreatment compatibility are the design targets for every heavy duty grade we blend.
8 grades in range
Why this range
Heavy duty diesel engine oil for on-highway, agricultural and earthmoving fleets
Bohr Chemical heavy duty diesel engine oils cover modern API CK-4 service fills and classic monogrades for older equipment. Soot handling, base number retention and oxidation control are dosed for long haul, high-load and dusty off-road duty, so oil analysis stays inside limits across the full drain interval.
Soot dispersancy
Controls viscosity rise from soot loading in EGR and high-duty-cycle diesel engines.
Aftertreatment compatible
CK-4 chemistry keeps sulphated ash, phosphorus and sulphur within DPF and SCR limits.
Wear protection under load
Strong anti-wear films protect cams, rings and liners through sustained peak torque.
Typical applications
- On-highway trucks and prime movers
- Agricultural tractors and harvesters
- Earthmoving and quarry plant
- Older diesel engines requiring monogrades
Featured grades
Most specified in this range
SAE 10W-30
Diesel Engine Oil 10W-30 CK-4
The fuel-economy grade of the CK-4 range: lighter cold-start viscosity and lower HTHS for line-haul fleets chasing miles per gallon.
API CK-4, CJ-4, CI-4 Plus, CI-4, CH-4ACEA E11, E7Mack EOS-4.5
SAE 20W-50
Diesel Engine Oil 20W-50
A specialty heavy duty fill for systems that need SAE 50 high-temperature viscosity with usable low-temperature fluidity — engines and hydrostatic drives alike.
API CF-2API CF
Full range
All heavy duty diesel engine oil
SAE 15W-40
Diesel Engine Oil 15W-40 CK-4
The mainstream heavy duty fill for mixed on- and off-highway fleets running CK-4, with full backward compatibility to CJ-4 and CI-4 Plus.
Specifications
API CK-4, CJ-4, CI-4 Plus, CI-4, CH-4API SNACEA E11, E7Mack EOS-4.5, EO-O Premium PlusVolvo VDS-4.5Cummins CES 20086Detroit Diesel DFS 93K222Caterpillar ECF-3MB 228.31Deutz DQC III-18 LAJASO DH-2
Features & benefits
- Fuel-efficient additive technology for lower operating cost
- Reduced CO2 emissions across the duty cycle
- Superior oxidation and oil consumption control
- Enhanced valve train wear control
- Excellent bearing and ring liner wear protection
- Improved control of oil thickening from soot loading
Typical properties
- Viscosity @ 40 °C, cSt
- 114.2
- Viscosity @ 100 °C, cSt
- 15.5
- Viscosity index
- 143
- HTHS @ 150 °C, cP min
- 3.7
- CCS viscosity, cP max
- 6,110 @ -20 °C
- Pour point, °C
- -25
- Flash point, °C
- 208
- Density, lb/gal
- 7.16
- Zinc, % wt.
- 0.127
- Phosphorus, % wt.
- 0.115
- TBN, mg KOH/g
- 10.0
SAE 10W-30
Diesel Engine Oil 10W-30 CK-4
The fuel-economy grade of the CK-4 range: lighter cold-start viscosity and lower HTHS for line-haul fleets chasing miles per gallon.
Specifications
API CK-4, CJ-4, CI-4 Plus, CI-4, CH-4ACEA E11, E7Mack EOS-4.5Volvo VDS-4.5Cummins CES 20086Detroit Diesel DFS 93K222Caterpillar ECF-3MB 228.31Renault RLD-4JASO DH-2
Features & benefits
- Lower viscous drag than 15W-40 for measurable fuel savings
- Cold pumping down to -35 °C pour point
- High viscosity index for a stable film across the temperature range
- Soot dispersancy that holds viscosity in EGR service
- Aftertreatment-compatible low-SAPS chemistry for DPF life
- Backward compatible with CJ-4 and CI-4 Plus fills
Typical properties
- Viscosity @ 40 °C, cSt
- 81.7
- Viscosity @ 100 °C, cSt
- 12.2
- Viscosity index
- 145
- HTHS @ 150 °C, cP min
- 2.9
- CCS viscosity, cP max
- 6,200 @ -25 °C
- Pour point, °C
- -35
- Flash point, °C
- 204
- Density, lb/gal
- 7.22
- Zinc, % wt.
- 0.127
- Phosphorus, % wt.
- 0.115
- TBN, mg KOH/g
- 10.0
SAE 20W-50
Diesel Engine Oil 20W-50
A specialty heavy duty fill for systems that need SAE 50 high-temperature viscosity with usable low-temperature fluidity — engines and hydrostatic drives alike.
Specifications
API CF-2API CF
Features & benefits
- Anti-wear protection of a heavy duty diesel oil at SAE 50 film thickness
- Superior thermal and oxidation stability against deposits, sludge and varnish
- High viscosity index with shear-stable viscosity modifiers
- Friction-fighting agents that extend engine life under sustained load
- Good low-temperature fluidity for a heavy multigrade
Typical properties
- Viscosity @ 40 °C, cSt
- 180
- Viscosity @ 100 °C, cSt
- 19
- Viscosity index
- 130
- CCS viscosity @ -10 °C, cP
- 4,500
- API gravity @ 60 °F
- 28
- Pour point, °F
- 0
- Zinc, % wt.
- 0.1
SAE 10W
Monograde Diesel Engine Oil SAE 10W
The lightest monograde in the range, for cold-climate off-highway plant and hydraulic-transmission systems specified on SAE 10W.
Specifications
API CF performance
Features & benefits
- Superior control of oil thickening from soot buildup
- Excellent ring and liner wear control
- Reduced bearing wear
- Premium corrosion control
- Superior control of piston deposits
Typical properties
- Viscosity @ 40 °C, cSt
- 39.0
- Viscosity @ 100 °C, cSt
- 6.5
- Viscosity index
- 105
- API gravity @ 60 °F
- 30.4
- Pour point, °F
- -20
- Sulfated ash, % wt. max
- 0.9
- Zinc, % wt.
- 0.13
- TBN, mg KOH/g
- 7.5
SAE 30
Monograde Diesel Engine Oil SAE 30
Monograde SAE 30 for two-stroke and older four-stroke diesel engines, stationary power and off-highway plant on seasonal fills.
Specifications
API CF-2API CF
Features & benefits
- Superior control of oil thickening from soot buildup
- Excellent ring and liner wear control
- Reduced bearing wear
- Premium corrosion control
- Superior control of piston deposits
Typical properties
- Viscosity @ 40 °C, cSt
- 94.0
- Viscosity @ 100 °C, cSt
- 11.3
- Viscosity index
- 104
- HTHS viscosity, cP
- 3.5
- API gravity @ 60 °F
- 27.8
- Pour point, °F
- -10
- Sulfated ash, % wt. max
- 0.9
- Zinc, % wt.
- 0.13
- TBN, mg KOH/g
- 7.5
SAE 40
Monograde Diesel Engine Oil SAE 40
The workhorse monograde: SAE 40 for hard-working earthmoving plant, marine auxiliaries and stationary diesel engines in warm service.
Specifications
API CF-2API CF
Features & benefits
- Superior control of oil thickening from soot buildup
- Excellent ring and liner wear control
- Reduced bearing wear
- Premium corrosion control
- Superior control of piston deposits
Typical properties
- Viscosity @ 40 °C, cSt
- 144.0
- Viscosity @ 100 °C, cSt
- 15.7
- Viscosity index
- 105
- HTHS viscosity, cP
- 4.6
- API gravity @ 60 °F
- 27.5
- Pour point, °F
- 0
- Sulfated ash, % wt. max
- 0.9
- Zinc, % wt.
- 0.13
- TBN, mg KOH/g
- 7.5
SAE 50
Monograde Diesel Engine Oil SAE 50
The heaviest monograde we blend, for high-temperature diesel service and transmissions that call for an SAE 50 engine oil.
Specifications
API CF-2API CF
Features & benefits
- Superior control of oil thickening from soot buildup
- Excellent ring and liner wear control
- Reduced bearing wear
- Premium corrosion control
- Superior control of piston deposits
Typical properties
- Viscosity @ 40 °C, cSt
- 205.0
- Viscosity @ 100 °C, cSt
- 19.4
- Viscosity index
- 104
- HTHS viscosity, cP
- 5.5
- API gravity @ 60 °F
- 27.1
- Pour point, °F
- 10
- Sulfated ash, % wt. max
- 0.9
- Zinc, % wt.
- 0.13
- TBN, mg KOH/g
- 7.5
SAE 10W-30
Universal Tractor Transmission Oil
One fill for transmission, wet brakes, final drives and hydraulics on farm equipment.
Specifications
API GL-4JDM J20CMassey M1145
Common questions
Heavy Duty Diesel Engine Oil FAQ
Can CK-4 oil be used in older diesel engines?
Yes, CK-4 is backward compatible with earlier API C-category service fills. Confirm the viscosity grade matches the engine manufacturer's recommendation.
Why choose 10W-30 over 15W-40?
10W-30 CK-4 gives faster cold-start oil delivery and measurable fuel-economy gains where the engine maker approves it. 15W-40 remains the safe universal fleet fill.
Talk to a lubrication engineer, not a call center
Send your equipment list and duty cycle. We will come back with a specification-matched recommendation and the data sheets to support it.