BRITON BTP 304 – BTP 404

BRITON BTP 304 – BTP 404 is a range of trunk piston engine oils developed for use in medium speed diesel engines burning residual fuels. BRITON BTP 304 – BTP 404 combines an exclusive formulation of latest additive technologies and a highly refined base oil to provide a substantial safety margin to cope with the higher stress levels even with the latest and future designs of diesel engines.

Product Description


  • Highly rated medium speed diesel engines used in marine and stationary power generation applications, burning heavy fuel oil with various qualities and Sulphur contents.
  • Particularly suitable for low or very low oil consumption engines operating with a poor quality residual fuel.
  • Bearings and stern-tubes.
  • Reduction gear lubrication.


  • Reduced build-up heavy deposits in the engine leading to a reduction in maintenance costs.
  • Excellent resistance to the negative effects of contamination with residual fuel.
  • Excellent thermal resistance and high temperature oxidation resistance.
  • Excellent control of viscosity increase leading to reduced top-ups.
  • Very good water resistance to maintain the engine performance and to remove the water rapidly after water ingress.
  • Very good wear protection and very good oil film strength at extreme pressures.

Typical Properties

Briton Grades 304 404
SAE Grade 30 40
Density at 15 °C ISO 3675 Kg/m3 910 910
Kinematic Viscosity 40°C ISO 3104 mm2 /s 112 140
Kinematic Viscosity 100°C ISO 3104 mm2 /s 12 14
Flash Point (COC) ASTM D 92 ASTM D 92 °C >or=230 >or=230
Pour Point ISO 3016 °C -9 -9
BN (ex TBN) ASTM D 2896 mgKOH/g 40 40
See also different:
  • Marine Oils