Castrol GTX Full Synthetic 5W-30 Motor Oil
Full Synthetic SAE 5W-30 Engine Oil for Gasoline and Diesel Engine Applications
Castrol GTX Full Synthetic 5W-30 is a full synthetic motor oil formulated to help control sludge, reduce engine wear, resist oxidation, and protect against viscosity breakdown. It is suitable for automotive gasoline and diesel engines where the manufacturer recommends an API SP, ILSAC GF-6, or earlier specification SAE 5W-30 lubricant.
Castrol GTX Full Synthetic is designed to address operating conditions that can contribute to sludge formation, including heat, short trips, and traffic. The full synthetic formulation provides protection against sludge formation and viscosity breakdown while supporting thermal and oxidation stability.
The 5W-30 grade is also approved for vehicles requiring a GM dexos1 Gen 3 lubricant.
Key Benefits
- Full synthetic SAE 5W-30 motor oil
- Suitable for applicable gasoline and diesel engine applications
- Helps clean existing sludge and protect against new sludge formation
- Formulated to protect critical engine parts from wear
- Provides resistance to viscosity breakdown
- Supports thermal and oxidation stability
- API SP performance claim
- ILSAC GF-6 performance claim
- GM dexos1 Gen 3 approved
- Meets Ford WSS-M2C946-A
- Meets Ford WSS-M2C946-B1
Applications
Castrol GTX Full Synthetic 5W-30 is suitable for automotive gasoline and diesel engines where the manufacturer recommends:
- SAE 5W-30 viscosity
- API SP or an earlier compatible API specification
- ILSAC GF-6 or an earlier compatible specification
- GM dexos1 Gen 3
- Ford WSS-M2C946-A
- Ford WSS-M2C946-B1
Always confirm the required viscosity and specifications in the vehicle owner's manual before use.
Performance Claims and Approvals
- SAE Viscosity Grade: 5W-30
- API: SP
- ILSAC: GF-6
- GM: dexos1 Gen 3 approved
- Ford: Meets WSS-M2C946-A
- Ford: Meets WSS-M2C946-B1
Castrol lists GM dexos1 Gen 3 approval numbers D330ACDA082, D330AACJ082, and D355AVEJ082 in its product data sheet.
Typical Characteristics
- Density at 15°C: 0.848 g/mL
- Kinematic Viscosity at 40°C: 64 mm²/s
- Kinematic Viscosity at 100°C: 11 mm²/s
- Viscosity Index: 174
- CCS Viscosity at -30°C: 3,900 mPa·s
- Pour Point: -45°C
- Flash Point, PMCC: 203°C
- Sulfated Ash: 0.92% by weight
Typical values are provided as a guide and may vary within normal manufacturing tolerances.
Oil Change Interval
Castrol states that GTX Full Synthetic 5W-30 provides protection for up to 10,000 miles or one year between oil changes, whichever comes first.
Actual oil-change intervals should follow the vehicle manufacturer's maintenance schedule and take into account operating conditions, vehicle age, engine condition, and service requirements.
Frequently Asked Questions
Is Castrol GTX 5W-30 fully synthetic?
Yes. Castrol GTX Full Synthetic 5W-30 is a full synthetic automotive motor oil.
Can Castrol GTX Full Synthetic 5W-30 be used in gasoline engines?
Yes. Castrol identifies this grade for automotive gasoline engines where the manufacturer recommends a compatible API SP, ILSAC GF-6, or earlier specification SAE 5W-30 lubricant.
Can Castrol GTX Full Synthetic 5W-30 be used in diesel engines?
The Castrol PDS states that this grade is suitable for automotive gasoline and diesel engines where the manufacturer recommends an applicable 5W-30 lubricant meeting the listed specifications. Always confirm compatibility with the engine manufacturer's requirements.
Is Castrol GTX Full Synthetic 5W-30 dexos1 approved?
Yes. Castrol lists GM dexos1 Gen 3 approval for this product.
What Ford specifications does Castrol GTX Full Synthetic 5W-30 meet?
The attached Castrol PDS states that it meets Ford WSS-M2C946-A and WSS-M2C946-B1.
Does Castrol GTX Full Synthetic 5W-30 meet API SP?
Yes. API SP is listed as a product performance claim on the attached Castrol data sheet.
Does Castrol GTX Full Synthetic 5W-30 meet ILSAC GF-6?
Yes. The attached PDS lists ILSAC GF-6.
How long can Castrol GTX Full Synthetic 5W-30 go between oil changes?
Castrol states protection for up to 10,000 miles or one year, whichever comes first. Follow the vehicle manufacturer's recommended maintenance interval if it is shorter or otherwise differs.
What is the viscosity of Castrol GTX Full Synthetic 5W-30?
Typical kinematic viscosity is 64 mm²/s at 40°C and 11 mm²/s at 100°C. Its viscosity index is 174.
What is the pour point of Castrol GTX Full Synthetic 5W-30?
The typical pour point is -45°C.
Can I use 5W-30 instead of 0W-20 or 5W-20?
Use the viscosity grade specified or permitted by the vehicle manufacturer. Different SAE grades are not automatically interchangeable simply because they belong to the same Castrol GTX Full Synthetic product family.
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