Castrol GTX A3/B4 10W-40 Semi Synthetic Engine Oil 5L

Castrol GTX A3/B4 10W-40 Semi Synthetic Engine Oil 5L is a semi synthetic 10W-40 engine oil from Castrol, supplied in a 5L pack. It meets ACEA A3/B4, API SP and carries manufacturer approvals including FIAT 9.55535-D2, FIAT 9.55535-G2, MB 226.5.

Castrol GTX is one of the world's best-known engine oils, with a double-action formula that cleans away existing sludge and helps stop new deposits forming.

Specifications at a glance

Suitable for

Use where the vehicle manufacturer calls for FIAT 9.55535-D2; FIAT 9.55535-G2; MB 226.5; MB 229.3; Renault RN 0700; Renault RN 0710; VW 501 01 / 505 00; FIAT 9.55535-D2. Commonly used in Volkswagen, Audi, SEAT and Skoda, Mercedes-Benz, Renault, Dacia and Nissan, Fiat, Alfa Romeo and Jeep vehicles. Always confirm the grade against your owner's handbook or service schedule before use, as requirements vary between engines of the same model.

Key benefits

• Semi-synthetic blend gives better protection than a mineral oil at an everyday price.
• ACEA A3/B4: a full-SAPS specification for high-performance petrol and diesel engines without particulate filters, with strong protection at extended drain intervals.
• API SP: the current API petrol engine category, with added protection against low-speed pre-ignition in turbocharged engines.

Frequently asked questions

Is Castrol GTX A3/B4 10W-40 right for my car?

Look in your handbook or on the oil filler cap for the specification codes listed above, such as FIAT 9.55535-D2. If your vehicle lists one of them, this oil meets the requirement. If you are unsure, send us your registration number and we will confirm the correct grade.

What does 10W-40 mean?

The first number (10W) describes how easily the oil flows when cold, so a lower number means easier cold starts. The second number describes the oil's thickness at normal running temperature. Always use the grade your manufacturer specifies.

How much oil will I need?

Most petrol and diesel cars take between 4 and 6 litres for a full oil change, so a 5L pack covers a typical service with some left for top-ups. Check your handbook for the exact capacity including the filter.

Supplied sealed in the manufacturer's original packaging and dispatched from the UK by Nitroma Lubricants.