Motul is a renowned French manufacturer of high-performance lubricants that has been developing innovative engine oils since 1853. Motul C2 and C4 engine oils were introduced as specialised formulations for modern diesel engines with exhaust aftertreatment systems. Choosing the right engine oil is critical to engine performance, fuel efficiency and vehicle longevity. This comparative article analyses the properties of both Motul products to help you make the best choice.
Comparison table of technical specifications: Motul C4 or Motul C2
Characteristic
Motul C2
Motul C4
Application
Diesel engines with DPF
Diesel engines with/without DPF
Viscosity class
0W-30, 5W-30, 5W-40
0W-20, 5W-30, 5W-40, 10W-40
Quality grade
Fully synthetic
Fully synthetic
Vehicle type
Passenger cars, light commercial vehicles
Passenger cars, light commercial vehicles
Engine equipment
Turbocharger, direct injection
Turbocharger, direct injection
API specifications
API SN/CF
API SN/CF
JASO standards
-
-
Density at 20 °C
0.845-0.860 kg/L
0.840-0.865 kg/L
Viscosity at 40 °C
45-75 mm²/s
40-95 mm²/s
Viscosity at 100 °C
9.3-14.5 mm²/s
8.5-16.0 mm²/s
Viscosity index
160-180
155-175
Flow point
-36 to -42 °C
-33 to -45 °C
Flash point
220-240 °C
215-245 °C
Similarities: Motul C2 or Motul C4
ACEA certification: Both fulfil strict European quality standards for modern diesel engines with advanced exhaust technology
Fully synthetic base: High quality synthetic base oils ensure optimum performance and protection under extreme operating conditions
Turbocharger compatibility: Specially developed for use in turbocharged diesel engines with high thermal loads
Fuel efficiency: Both formulations help to reduce fuel consumption through optimised friction properties
Oxidation stability: Outstanding protection against oil ageing and sludge formation with extended drain intervals
Cold protection: Reliable lubrication and pumpability even at low outside temperatures
Environmental compatibility: Reduced emissions thanks to optimised combustion support and catalytic converter protection
Differences: Motul C2 vs Motul C4
Characteristic
Motul C2
Motul C4
SAPS level
Low SAPS (low sulphur, phosphorus and ash content)
Mid SAPS (medium sulphur, phosphorus and ash content)
DPF optimisation
Specially developed for diesel particulate filters
Universal diesel engine compatibility
Additive package
Reduced additive concentration
Increased additive concentration
Area of application
Modern Euro 5/6 diesel engines
Wider diesel engine compatibility
Maintenance intervals
Extended intervals possible
Standard maintenance intervals
Ash formation
Minimal ash production
Moderate ash production
Engine protection
Optimised for DPF protection
Increased wear protection
Availability
Limited viscosity choice
Extended viscosity range
Conclusion
The choice between Motul C2 vs Motul C4 depends primarily on the engine equipment and the specific requirements. Motul C2 is ideal for modern diesel vehicles with diesel particulate filters that frequently travel long distances and want to benefit from extended maintenance intervals. Motul C4, on the other hand, offers a more versatile solution for various diesel engines and is particularly suitable for vehicles without DPF or in mixed driving conditions. Both oils ensure reliable engine protection and fuel efficiency, although the specific vehicle specifications and manufacturer approvals should be taken into account when making a decision.
Frequently Asked Questions (FAQ)
Which engine oil delivers better performance - Motul C2 vs Motul C4 5W-30?
Motul C2 5W-30 offers optimised performance for DPF-equipped vehicles by reducing ash formation. Motul C4 5W-30 provides enhanced wear protection for a wider range of engines. Performance depends on the specific engine equipment.
Can I mix Motul C2 and Motul C4?
Mixing different SAPS levels is not recommended as this may affect the specific properties. When changing the oil, the system should be completely drained and filled with the new oil.
What packaging sizes are available for Motul C2 vs Motul C4?
Both oils are available in packaging sizes from 1 litre to 208 litres. The 5 litre containers are most commonly available for private users, while larger quantities are offered for workshops and fleet operators.
How often should the oil be changed with Motul C2 vs Motul C4?
Motul C2 often allows extended change intervals of up to 30,000 km due to its low SAPS formulation. Motul C4 follows standard intervals of 15,000-20,000 km, depending on the manufacturer's specifications.
Are both oils suitable for turbocharged engines?
Yes, both Motul C2 and Motul C4 are specially developed for modern turbocharged diesel engines. Both provide excellent protection against high-temperature oxidation and ensure reliable lubrication under extreme conditions.
Which oil is more cost effective - Motul C2 or Motul C4?
Motul C4 is generally cheaper to purchase, while Motul C2 can be more economical in the long term due to extended drain intervals. The total cost depends on the individual driving conditions.
Are there differences in environmental compatibility between Motul C2 and C4?
Motul C2 offers better protection for exhaust aftertreatment systems and contributes to reduced emissions due to its low SAPS formulation. However, both oils support modern environmental standards and catalytic converter functions.
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Parts Details
Capacity [litre]: 4
API:
API TC
Product line: 800 FL
Version: OFF ROAD 2T
Item number:
104039
Oil manufacturer recommendation: Above standards
Packing Type:
Canister
Engine Features / Arrangement:
2-Stroke
Supplementary Article / Supplementary Info Info 2:
Only for racing purposes
Manufacturer recommendations: BMW Longlife-01, MB 229.5, MB 226.5, Porsche A40, Renault RN0700, Renault RN0710, VW 502 00, VW 505 00, Fiat 9.55535-H2, Fiat 9.55535-M2, Fiat 9.55535-N2, Fiat 9.55535-Z2, GM LL-B-025, PSA B71 2296
Manufacturer recommendations: BMW Longlife-04, Ford WSS-M2C917-A, DEXOS 2, MB 229.51, Porsche A40, Renault RN0700, Renault RN0710, Chrysler MS-12991, VW 505 00, VW 505 01, Fiat 9.55535-S2, Fiat 9.55535-GH2, Fiat 9.55535-T2
6 January 2026 (updated) 
