2025 Isuzu NPR Fluid Type Specs

Quick Reference

Fluid	Type/Spec	Capacity
Engine Oil	SAE 5W-30 / API SP	Verify in owner's manual
Engine Coolant	OAT, Red/Pink	Verify in owner's manual
Transmission Fluid	Dexron VI	Verify in owner's manual
Rear Differential	75W-90	Verify in owner's manual
Brake Fluid	DOT 3	Verify in owner's manual
Power Steering	ATF	Verify in owner's manual
Washer Fluid	---	Verify in owner's manual
Diesel Exhaust Fluid	API CK-4 / ISO 22241	Verify in owner's manual

Engine Oil

The 2025 Isuzu NPR requires SAE 5W-30 engine oil that meets the API SP specification. This oil provides the necessary protection and performance for the engine, ensuring proper lubrication and minimizing wear. Regular oil changes are crucial for maintaining engine health, so it's important to follow the manufacturer's recommended service intervals. Always verify the exact oil capacity in your owner's manual before performing an oil change.

Engine Coolant

The cooling system in the 2025 Isuzu NPR uses an Organic Acid Technology (OAT) coolant, which is typically red or pink in color. It's essential to use the correct type of coolant to prevent corrosion and ensure efficient heat transfer. Mixing different types of coolant, such as OAT and Hybrid Organic Acid Technology (HOAT), can lead to a chemical reaction that reduces the coolant's effectiveness and can cause damage to the cooling system. Never use a universal coolant, as it may not provide the same level of protection as the factory-spec fluid.

Transmission Fluid

The automatic transmission in the 2025 Isuzu NPR requires Dexron VI automatic transmission fluid (ATF). This synthetic fluid is designed to provide consistent shift performance and protect the transmission from wear. Using the wrong type of ATF can lead to shifting problems and even transmission failure. Always confirm the correct fluid type and capacity in your owner's manual.

Rear Differential

The rear differential on the 2025 Isuzu NPR uses 75W-90 gear oil. This fluid lubricates the gears in the differential, ensuring smooth operation and preventing wear. If your truck is equipped with a limited-slip differential (LSD), it may require a special additive to be mixed with the gear oil. Check your owner's manual or OEM service information to confirm if an LSD additive is necessary.

Brake Fluid

The hydraulic brake system in the 2025 Isuzu NPR requires DOT 3 brake fluid. It is crucial to use the correct type of brake fluid to ensure proper brake performance and safety. Never mix different types of brake fluid, as this can compromise the braking system. The brake fluid should be changed at the manufacturer's recommended intervals to prevent moisture contamination, which can lead to a soft brake pedal and reduced braking power.

Power Steering

The power steering system in the 2025 Isuzu NPR uses automatic transmission fluid (ATF). While it may seem unusual to use ATF in the power steering system, it is the factory-specified fluid. Using the wrong type of fluid can damage the power steering pump and other components. Always refer to your owner's manual to confirm the correct fluid type.

Washer Fluid

There is no specific type of washer fluid required for the 2025 Isuzu NPR. Any standard washer fluid will work. However, it is a good idea to use a washer fluid that is appropriate for the climate in which you live. For example, in colder climates, a washer fluid with a lower freezing point is recommended.

Diesel Exhaust Fluid (DEF)

For diesel-powered 2025 Isuzu NPR models, Diesel Exhaust Fluid (DEF) that is API CK-4 certified and meets the ISO 22241 standard is required. DEF is a non-toxic solution that is used to reduce harmful emissions from the exhaust. It is important to use only high-quality DEF, as contaminated or low-quality DEF can damage the selective catalytic reduction (SCR) system.

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