The Three Types
| Type | Description | Price Range (5L) | Change Interval |
|---|---|---|---|
| Full Synthetic | Chemically engineered for maximum performance | £25–45 | 10,000–20,000 miles |
| Semi-Synthetic | Blend of synthetic and mineral base oils | £18–30 | 7,500–10,000 miles |
| Mineral | Refined from crude petroleum | £12–20 | 3,000–5,000 miles |
Recommended Engine Oils for Synthetic vs Mineral
As an Amazon Associate we earn from qualifying purchases. Always confirm the exact fitment for your model & year before buying.
Which Should I Use?
Most modern cars (2010+) require fully synthetic oil. Your manufacturer specification code (e.g., VW 508 00, Ford WSS-M2C913-D) almost always mandates synthetic. Semi-synthetic is suitable for some older vehicles, while mineral oil is now only appropriate for classic cars.
Frequently Asked Questions
Can I switch from mineral to synthetic?
Yes — switching to synthetic won’t damage your engine and will provide better protection. However, in very high-mileage engines, the improved cleaning properties of synthetic oil can loosen built-up deposits, potentially revealing existing gasket leaks.
Is fully synthetic oil worth the extra cost?
For any car that requires it, absolutely. The longer change intervals alone often offset the higher price. For older cars that don’t require it, it’s still beneficial but not essential.
Can I mix synthetic and mineral oil?
In an emergency, yes — they’re compatible. However, mixing reduces the performance advantages of synthetic oil. Top up with the same type when possible.
Recommended Products
How we check fitment for this guide
We cross-reference fitment figures against manufacturer specifications and OE-supplier catalogue data where available, and matched to the standard codes that actually govern fit — battery type/group sizes, wiper lengths and fitting types, bulb fitment codes, tyre size markings, and oil specifications. We work by make, model, year, engine, and build date, because a single model can take different parts across its life. Where the right part depends on your exact vehicle, we tell you to confirm by registration or VIN. More on our method →