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10W40 CK-4 Oil Equivalent — Brand Comparison & Cross Reference

API CK-4 10W-40 is a premium heavy-duty diesel engine oil offering improved fuel economy over 15W-40 grades while maintaining the same robust protection. Commonly used in modern diesel engines with exhaust after-treatment systems including DPF and SCR.

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Brand Comparison Table

The following table shows the 10W40 CK-4 equivalent product from each major lubricant brand. Use this to find a direct substitute when switching suppliers or sourcing alternatives.

BrandProduct Name
Sinopec logoSinopec
L1500
Castrol logoCastrol
Vecton Long Drain
Mobil logoMobil
Delvac XHP ESP
Shell logoShell
Rimula R6 LM
Valvoline logoValvoline
Profleet IS
Caltex logoCaltex
Delo 400 SLK
Fuchs logoFuchs
Titan Cargo Maxx
Penrite logoPenrite
Enviro+
Gulf Western logoGulf Western
Top Dog Global

Common Applications

  • Modern Euro 6 and EPA Tier 4 diesel engines
  • Mixed fleet applications requiring improved fuel economy
  • Trucks with DPF and SCR after-treatment systems
  • Vocational vehicles (refuse trucks, mixers)
  • Transit buses and coaches

Frequently Asked Questions

Does 10W-40 CK-4 provide better fuel economy than 15W-40?

Yes. The lower cold-start viscosity of 10W-40 reduces parasitic drag during warm-up, which can improve fuel economy by 1-3% compared to 15W-40 in the same engine, depending on operating conditions.

Can I switch from 15W-40 to 10W-40 CK-4 in my truck?

Check your engine manufacturer's recommendations first. Many modern diesel engines are approved for both 10W-40 and 15W-40 CK-4 oils. Using 10W-40 in an approved engine can offer fuel savings and better cold-weather performance.

Is 10W-40 CK-4 a synthetic oil?

10W-40 CK-4 oils may be either synthetic or synthetic-blend formulations, depending on the brand. Check the product data sheet for the base oil type. Most premium 10W-40 CK-4 products use a synthetic or Group III base oil.

Related Engine Oil Specifications

15W40 CK-4PCMO C2 0W-30PCMO C3 5W-30PCMO C5 0W-20

Related Articles

Engine Oil Cross Reference: How to Match the Right AlternativeRead article →Oil Cross Reference Tool: Find the Right Lubricant Equivalent InstantlyRead article →

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