What Castrol motor oil should I use in my vehicle?

The correct Castrol motor oil depends on the viscosity grade and performance specifications required by your vehicle manufacturer. Start with the owner's manual and look for the requirements such as SAE viscosity, API or ILSAC service category, and any manufacturer-specific approvals.

PSC carries Castrol motor oils across several product families, including Castrol EDGE, EDGE Euro Car, GTX, GTX High Mileage, GTX Ultraclean, and GTX Full synthetic. These are available in multiple viscosity grades for different vehicle and engine requirements.

What is the difference between Castrol EDGE and Castrol GTX?

Castrol EDGE is Castrol's full-synthetic motor oil family, while the GTX line includes conventional, synthetic-blend, high-mileage, and full-synthetic formulations depending on the product.

Rather than selecting between EDGE and GTX based on the product family alone, compare the viscosity grade, formulation type, performance specifications, and manufacturer requirements for your engine.

What do Castrol oil grades like 0W-20, 5W-30, and 10W-40 mean?

These numbers identify the oil's SAE viscosity grade. The number before the W relates to the oil's low-temperature performance, while the second number describes viscosity at normal engine operating temperature.

A higher or lower viscosity grade is not automatically better. Use the viscosity grade recommended by the vehicle manufacturer.

When should I use Castrol GTX High Mileage motor oil?

High-mileage motor oils are formulated around conditions commonly associated with aging engines. Castrol generally uses 75,000 miles or more as the point at which a vehicle may be considered high mileage.

PSC carries Castrol GTX High Mileage motor oils in selected viscosity grades. The correct product should still meet the viscosity and performance requirements specified for the vehicle.

What is the difference between conventional, synthetic-blend, and full-synthetic motor oil?

The main difference is the type of base oils used in the formulation.

Conventional motor oil primarily uses mineral base oils. Synthetic-blend oil combines conventional and synthetic base oils. Full-synthetic oil uses synthetic base-oil components designed to provide performance advantages in areas such as temperature stability, low-temperature flow, deposit control, volatility, and viscosity stability.

Regardless of formulation type, the oil should meet the specifications required by the engine manufacturer.

What Castrol transmission fluid does my vehicle need?

Transmission-fluid requirements vary by vehicle make, model, year, and transmission design. PSC carries Castrol transmission fluids for several common specifications and applications, including:

• DEXRON and MERCON applications
• DEXRON VI and MERCON LV applications
• Import multi-vehicle applications
• Continuosly variable transmissions
• Type F applications
• Allison TES 668 transmissions

Always confirm the transmission manufacturer's required fluid specification before selecting a product.

Find the Castrol Transmission Fluid Guide HERE

Is CVT fluid the same as regular automatic transmission fluid?

Not necessarily. Continuously variable transmissions have different operating and friction requirements from many conventional automatic transmissions.

Use a fluid that is specifically approved or recommended for the transmission rather than assuming a standard automatic transmission fluid can be substituted. PSC carries Castrol Transmax ATF/CVT Fluid for applicable applications.

What is Castrol TranSynd 668 used for?

Castrol TranSynd 668 is a full-synthetic automatic transmission fluid formulated for Allison hevay-duty on-highway automatic transmissions requiring the Allison TES 668 specification.

TES 668 is backward compatible with many applications previously requiring TES 295 or TES 468. Always confirm the transmission manufacturer's fluid requirements before use. TranSynd 668 is not intended for every Allison transmission application.