BOSS Lubricants Bulk Diesel Engine Oil CK-4 Full Synthetic & Extreme – 0W-40 · 5W-40 · 15W-40 Synthetic · 10W-30 · 15W-40 Extreme Low Ash EGR DPF SCR On/Off Highway – 205L Drum (Presold Only)
31312-205L
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DRUM/TOTE CHARGE - $50.00 per Drum/$250.00 per Tote, refundable when returned in original condition
Premium Canadian-made BOSS API CK-4 heavy-duty diesel engine oils – choose premium Full Synthetic (true Group III – 0W-40, 5W-40, 15W-40) utilizing advanced base stocks for ultimate cold-weather flow, fuel economy, thermal stability, and extended drains in extreme Canadian winters, or Extreme (10W-30 fuel-economy & proven 15W-40) with Group II+ base oils for outstanding soot control, wear protection, oxidation/aeration resistance in high-load, high-soot, mixed fleets. Both lines are low-ash formulations engineered to exceed the latest CK-4 requirements (including new oxidation & aeration tests) for 2010+ EGR/EGP / 2017+ GHG engines with DPF/SCR systems while being fully backward compatible with CJ-4/CI-4+ and older specs – perfect for trucking, construction, agriculture, mining, logging, and severe-service diesel engines.
All grades deliver exceptional piston cleanliness, valve train protection, shear stability, TBN retention, and extended drain capability even under severe operating conditions with high soot loading and fuel sulfur levels, while minimizing combustion chamber ash deposits and protecting engine components with high alkaline reserves.
✅ Key Benefits:
- Exceeds API CK-4 & backward compatible to CJ-4, CI-4+, CI-4, CH-4
- Outstanding soot thickening control & aeration resistance – passes latest CK-4 tests
- Superior wear protection for cams, bearings, cylinder liners & valve train
- Exceptional piston deposit control & engine cleanliness
- High TBN retention for extended drain intervals & acid neutralization
- Excellent oxidation, thermal & shear stability – stays in grade longer
- Low-ash formulation protects DPF, SCR & catalytic converters
- Outstanding cold-start performance & pumpability (especially low-vis synthetics)
- Minimizes combustion chamber ash deposits
- Proudly formulated and bottled in Canada
✅ Grade-Specific Advantages:
- 0W-40 Full Synthetic → Ultimate arctic cold-start flow (-54°C pour), maximum fuel economy, extended drains in extreme cold fleets
- 5W-40 Full Synthetic → Superior all-season performance, high VI, maximum protection in severe duty & high temperatures
- 15W-40 Full Synthetic → Robust high-temperature protection with wide viscosity range, ideal for hot climates and heavy loads
- 10W-30 Extreme → Fuel-economy optimized for modern GHG engines, lower viscosity, excellent soot handling in mixed fleets
- 15W-40 Extreme → The #1 heavy-duty workhorse – proven high-soot protection, perfect for mixed fleets & hot climates
Typical Physical Specifications (values are representative of current production):
0W-40 Full Synthetic • Density @ 15.5°C, kg/L: 0.866 • Kinematic Viscosity @ 40°C: 87.27 cSt • Kinematic Viscosity @ 100°C: 15.14 cSt • Viscosity Index: 180 • CCS @ –35°C: 5360 cP • Pour Point: –54°C • Flash Point: 188°C • TBN: 10 • Ash Sulphate, Mass%: 0.99 • HT/HS @ 150°C: 3.55 cP
5W-40 Full Synthetic • Density @ 15.5°C, kg/L: 0.877 • Kinematic Viscosity @ 40°C: 87.75 cSt • Kinematic Viscosity @ 100°C: 14.76 cSt • Viscosity Index: 177 • CCS @ –35°C: 5600 cP • Pour Point: –45°C • Flash Point: 225°C • TBN: 10 • Ash Sulphate, Mass%: 0.99 • HT/HS @ 150°C: 3.85 cP
15W-40 Full Synthetic • Density @ 15.5°C, kg/L: 0.881 • Kinematic Viscosity @ 40°C: 115 cSt • Kinematic Viscosity @ 100°C: 15.05 cSt • Viscosity Index: 146 • CCS @ –20°C: 5800 cP • Pour Point: –43°C • Flash Point: 232°C • TBN: 10 • Ash Sulphate, Mass%: 0.99 • HT/HS @ 150°C: 4.27 cP
10W-30 Extreme • Specific Gravity @ 15.6°C: 0.0865 • Kinematic Viscosity @ 40°C: 81.7 cSt • Kinematic Viscosity @ 100°C: 12.2 cSt • Viscosity Index: 145 • Pour Point: –39°C • Flash Point: 237°C • CCS @ –25°C: 6200 cP • Ash Sulphate, wt%: 1.00 • TBN: 9.1
15W-40 Extreme • Specific Gravity @ 15.6°C: 0.0869 • Kinematic Viscosity @ 40°C: 113.9 cSt • Kinematic Viscosity @ 100°C: 15.6 cSt • Viscosity Index: 145 • Pour Point: –33°C • Flash Point: 226°C • CCS @ –20°C: 5500 cP • Ash Sulphate, wt%: 1.00 • TBN: 9.5
Meets or Exceeds: • API CK-4, CJ-4, CI-4+, CI-4, CH-4 (all grades) • API SN (5W-40, 15W-40 Synthetic) • Cummins CES 20086, 20081, 20087, 20071, 20072, 20076, 20077, 20078 (all grades) • Detroit Diesel DFS 93K222, 93K218, 93K233, 75E 270, 93K215/14 (all grades) • Volvo VDS-4.5, VDS-4, VDS-3, VDS-2 (all grades) • Mack EOS-4.5, EO-O Premium Plus, EO-N PP 03', EO-M (all grades) • Caterpillar ECF-3, ECF-2, ECF-1 (all grades) • Mercedes MB 228.31, 228.3 (all grades) • MAN M3575, 3275 (all grades) • ACEA E7 (all grades) • Ford WSS-M2C171-F1 (all grades) • Renault RLD-4, RLD-3 (all grades) • MTU Category 2.1 (all grades) • JASO DH-2 (all grades) • Global DHD-1 (Synthetic grades) • MIL-L-2104 E/F (Synthetic grades) • Extension sequences in IIIE, VE and L-38 bench test (Synthetic grades) • Daimler MB 228.31 (Extreme grades) • Suitable for virtually all North American, European & Asian on/off-highway diesel engines requiring CK-4 or earlier specifications
Package Size: • 205L steel drum (bulk – presold only) • Drum deposit: $50.00 refundable when returned in original condition (tote deposit $250.00 if applicable)
• Made in Canada
EHC is included in the price
Care Instructions
Care Instructions
Please refer to the product instructions for care and safe usage.

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