Synthetic or semi-synthetic oil — which to choose?

Synthetic or semi-synthetic oil — it’s one of drivers’ most common questions. The choice affects engine protection, change intervals and running costs.

How do they differ?

Synthetic oil is produced in a chemical process, giving it more stable properties across a wide temperature range. Semi-synthetic is a blend of mineral and synthetic base — cheaper, but less resistant.

• Synthetic: better protection, longer intervals, higher price
• Semi-synthetic: lower cost, for older or less demanding engines
• Synthetic copes better in frost and at high temperatures
• Semi-synthetic is sometimes chosen for older, high-mileage cars

Which to choose for your car?

The most important thing is the manufacturer’s recommendations — they define the required quality and approvals. Modern engines almost always require synthetic oil. For older, high-mileage designs a dedicated high mileage oil is sometimes better.

Not sure what to use? During a mobile oil change we’ll match the product to your engine’s specification — from Castrol to Motul.