• 10w40 API CI-4 synthetic oil, castrol gtx 10w40 API CI-4
  • 10w40 API CI-4 synthetic oil, castrol gtx 10w40 API CI-4
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SOLAR Optima Series Diesel Engine Oils 10W40 API CI-4

Description

SOLAR OPTIMA 10W40 is a high-performance semi-synthetic diesel engine oil, specially formulated to provide enhanced protection, thermal stability, and extended engine life for both modern and older diesel engines. Meeting API CI-4 specifications, it offers excellent wear protection, oxidation resistance, and superior soot handling to ensure maximum engine efficiency and longevity.

Blended with high-quality synthetic and mineral base oils, along with an advanced additive package, SOLAR OPTIMA 10W40 ensures enhanced performance in extreme operating conditions, making it an ideal choice for commercial fleets, heavy-duty vehicles, and off-road equipment.

Available API
CH-4
CH-4/SL
Applications
  • Suitable for heavy-duty diesel engines in trucks, buses, and construction equipment.
  • Recommended for fleet vehicles, off-highway equipment, and industrial diesel applications.
  • Ideal for turbocharged and naturally aspirated diesel engines.
  • Designed for modern emission-compliant engines, including those with EGR (Exhaust Gas Recirculation) systems.
  • Suitable for high-mileage diesel engines requiring enhanced protection against wear and oil consumption.
Features & Benefits

  • Enhanced Wear Protection – Reduces friction and prolongs engine life.

  • Superior Oxidation & Thermal Stability – Prevents oil breakdown and deposit formation.

  • Extended Drain Intervals – Reduces downtime and maintenance costs.

  • Excellent Soot & Sludge Control – Keeps the engine clean for improved efficiency.

  • Optimized Fuel Economy – Reduces internal friction for better mileage.

  • Cold Weather Performance – Ensures smooth start-ups and lubrication at low temperatures.

  • High Shear Stability – Maintains viscosity under extreme loads and high temperatures.

Recommended for Vehicles & Assemblies Requiring

  • API CI-4, CH-4, CG-4, CF-4, CF or equivalent.

  • ACEA E7, E5, E3 standards.

  • ILSAC GF-4 equivalent for fuel efficiency benefits.

  • Meets or exceeds OEM requirements for Cummins, Caterpillar, Detroit Diesel, MAN, Mercedes-Benz, Volvo, Renault Trucks, and other major diesel engine manufacturers.

Key Properties

Physical Properties

Properties

10W40

API / ACEA Classification

API CI-4, ACEA E7/E5/E3

Appearance

Bright & Clear

Specific Gravity @15°C

0.870

Flash Point °C

230

Pour Point °C

-36

Viscosity @40 °C, cSt

96.5

Viscosity @100 °C, cSt

14.2

Viscosity Index

142

Total Base No, mg KOH/g

10.0

Cold Cranking Viscosity (cP)

6500 @ -25°C

HTHS Viscosity @ 150°C (mPa.s)

4.0

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