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Doosan Forklift Oil Type – Complete Lubricant Specification Guide

Published time：

2026-07-22

Author：

Xin Hong Guang

Source：

Xin Hong Guang

Abstract

Doosan forklifts require specific lubricants depending on the model, engine type (diesel or LPG), and operating environment. The most reliable source of information is the operator’s manual for your specific forklift. However, the following guide provides general recommendations based on common Doosan specifications.Engine Oil (Diesel and LPG Models)Engine oil is the most critical lubricant for internal combustion Doosan forklifts.API Service Classification: For newer Doosan forklifts (typically Tier 4 or Stage V compliant), API CK-4 is recommended. For older models, API CI-4 or API CH-4 are common and suitable choices.SAE Viscosity: SAE 15W-40 is the most common multi-grade oil, suitable for a wide range of operating temperatures. For colder climates, SAE 10W-30 may be used to improve cold-start performance.Additional Certifications: Oils meeting ACEA E7 or JASO DH-2 specifications provide higher performance standards and are recommended where available.Hydraulic OilHydraulic oil powe

Doosan forklifts require specific lubricants depending on the model, engine type (diesel or LPG), and operating environment. The most reliable source of information is the operator’s manual for your specific forklift. However, the following guide provides general recommendations based on common Doosan specifications.


Engine Oil (Diesel and LPG Models)


Engine oil is the most critical lubricant for internal combustion Doosan forklifts.


API Service Classification: For newer Doosan forklifts (typically Tier 4 or Stage V compliant), API CK-4 is recommended. For older models, API CI-4 or API CH-4 are common and suitable choices.


SAE Viscosity: SAE 15W-40 is the most common multi-grade oil, suitable for a wide range of operating temperatures. For colder climates, SAE 10W-30 may be used to improve cold-start performance.


Additional Certifications: Oils meeting ACEA E7 or JASO DH-2 specifications provide higher performance standards and are recommended where available.


Hydraulic Oil


Hydraulic oil powers the lift and tilt systems.


Type: High-quality anti-wear hydraulic oil.


Viscosity Grade: ISO VG 32 or ISO VG 46 are the most common grades. The choice depends on ambient temperature—VG 32 for colder environments, VG 46 for warmer conditions.


Standard: Should meet DIN 51524 Part 2 (HLP) or Part 3 (HVLP) specifications.


Transmission Fluid


Doosan forklifts typically use automatic or powershift transmissions requiring specialized transmission fluid.


Type: Automatic Transmission Fluid (ATF) meeting Allison C-4 or Dexron III specifications. These ensure correct friction characteristics and lubrication for the transmission.


Other Lubricants


Differential and Axle Oil: Typically SAE 80W-90 or SAE 90 gear oil meeting API GL-5 specifications.


Grease: Multi-purpose lithium-based grease (NLGI Grade 2) for chassis, steering linkages, and mast pivot points.


Brake Fluid: For hydraulic brake systems, use DOT 3 or DOT 4 brake fluid as specified in the manual.


Important Recommendations


Consult the Operator’s Manual – Always verify the specific oil requirements for your Doosan model (e.g., D25S-5, G30E-3, B30X-7) before adding or changing fluids.


Use High-Quality Lubricants – Use reputable brands that meet or exceed the recommended specifications to ensure performance and longevity.


Follow Service Intervals – Adhere to the manufacturer’s recommended oil change intervals (typically 500–1,000 hours for engine oil, depending on model and usage).


Dispose of Oil Properly – Used oil must be collected and disposed of according to local environmental regulations.


Summary


Doosan forklifts require specific lubricants: API CK-4/CI-4 15W-40 engine oil for diesel/LPG engines, ISO VG 32/46 anti-wear hydraulic oil for hydraulic systems, Allison C-4/Dexron III ATF for transmissions, and SAE 80W-90 GL-5 gear oil for differentials. Always confirm specifications in the operator’s manual for your specific model. Using the correct oil type and adhering to service intervals ensures reliable performance, reduces wear, and extends the life of your Doosan forklift.

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doosan forklift oil type
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