OKAYA ULTIMAXE Diesel Engine Oils | TURBO SHIELD CI-4+, TURBO SPARK CH-4 & TURBO SPEED CF-4
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OKAYA ULTIMAXE Diesel Lubricants

Performance for the Road.
Protection for the Engine.

Engineered for high-mileage commercial fleets, turbocharged trucks, and heavy tractors to provide soot dispersion, sludge control, and extended engine life.

15W-40 API CI-4+ 15W-40 API CH-4 15W-40 API CF-4
Product Catalogue

Explore Our Diesel Engine Oil Range

Review viscosity specifications, available canister configurations, and key engineering metrics across our heavy-duty diesel lineup.

TURBO SHIELD 15W-40 API CI-4+ OKAYA ULTIMAXE
OKAYA ULTIMAXE
DIESEL OIL 15W-40 API CI-4+
OKAYA ULTIMAXE® · DIESEL ENGINE OIL

TURBO SHIELD 15W-40 API CI-4+

Superior Soot Control & Extreme-Duty Protection for Turbocharged Fleets

OKAYA ULTIMAXE TURBO SHIELD 15W-40 API CI-4+ Heavy-Duty Diesel Engine Oil.

A high-performance multigrade diesel oil blended with advanced shear-stable polymers and high-dispersancy chemistry. Engineered for high-output, low-emission turbocharged commercial diesel engines facing high loads, long haulage, and severe thermal stress.

Key product features
SAE 15W-40 | API CI-4+ / SL Specification Advanced Soot Dispersancy Prevents Oil Thickening Superior Valvetrain & Turbocharger Protection Controls High-Temperature Piston Deposits Extended Oil Drain Intervals in Commercial Fleets
Available pack sizes
1 L 3 L 3.5 L 5 L 6 L 7 L 7.5 L 8.5 L 10 L 12 L 13 L 15 L 18 L 20 L 26 L 50/55 L 210 L
ENQUIRE ABOUT THIS PRODUCT
TURBO SPARK 15W-40 API CH-4 OKAYA ULTIMAXE
OKAYA ULTIMAXE
DIESEL OIL 15W-40 API CH-4
OKAYA ULTIMAXE® · DIESEL ENGINE OIL

TURBO SPARK 15W-40 API CH-4

All-Weather Heavy Commercial Engine Lubrication for Trucks & Machinery

OKAYA ULTIMAXE TURBO SPARK 15W-40 API CH-4 Diesel Engine Oil.

Designed for turbocharged and naturally aspirated diesel engines operating in fleet transport, mining haulage, and agricultural machinery. Features high total base number (TBN) retention to neutralize acidic byproducts and prevent bore polishing.

Key product features
SAE 15W-40 | API CH-4 Certified Resists Sludge Formation & Carbon Buildup Prevents Cylinder Liner Wear & Bore Polishing High Oxidation & Thermal Degradation Resistance Reliable All-Weather Engine Protection
Available pack sizes
1 L 3 L 3.5 L 5 L 6 L 7 L 7.5 L 8.5 L 10 L 12 L 13 L 15 L 18 L 20 L 26 L 50/55 L 210 L
ENQUIRE ABOUT THIS PRODUCT
TURBO SPEED 15W-40 API CF-4 OKAYA ULTIMAXE
OKAYA ULTIMAXE
DIESEL OIL 15W-40 API CF-4
OKAYA ULTIMAXE® · DIESEL ENGINE OIL

TURBO SPEED 15W-40 API CF-4

Dependable Lubrication for General Commercial Fleets & Legacy Tractors

OKAYA ULTIMAXE TURBO SPEED 15W-40 API CF-4 Diesel Engine Oil.

A durable multigrade diesel engine oil formulated for older commercial vehicles, farm tractors, and stationary generators specifying API CF-4. Maintains steady oil pressure, prevents scuffing, and controls oil consumption under continuous engine load.

Key product features
SAE 15W-40 | API CF-4 Spec Shields Bearings & Rings from Metal Wear Maintains Stable Oil Pressure in Long Runs Controls Oil Burn-Off in High-Heat Climates Comprehensive Pack Range: 500 mL to 210 L
Available pack sizes
500 mL 1 L 3 L 3.5 L 5 L 6 L 7 L 7.5 L 8.5 L 10 L 12 L 13 L 15 L 18 L 20 L 26 L 50/55 L 210 L
ENQUIRE ABOUT THIS PRODUCT
Important Information

Choosing the Correct Diesel Engine Oil

Always verify the API service classification and viscosity rating recommended by your engine manufacturer.

01

Check SAE Viscosity

Confirm that SAE 15W-40 is specified for your engine operating environment and temperature requirements.

02

Check API Service Level

Select CI-4+ for modern turbo fleets, CH-4 for commercial transport, and CF-4 for legacy equipment.

03

Confirm Technical Data

Refer to latest product Technical Data Sheets (TDS) and batch Certificates of Analysis (COA) for lab test results.

Technical information: Specifications such as kinematic viscosity, flash point, pour point, TBN, and sulfated ash are detailed on the latest TDS. Confirm compatibility with your equipment manufacturer before selection.

Need Product Details or a Bulk Quote?

Contact OKAYA ULTIMAXE® sales and technical representatives for pack availability, commercial trade rates, and barrel dispatches.

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