Quick Answers
| Can I mix… | Answer | Notes |
|---|---|---|
| Different brands? | Yes | Same grade and spec — safe to mix |
| Different grades? | Emergency only | Results in an intermediate grade — change soon |
| Synthetic and mineral? | Emergency only | Compatible but reduces synthetic benefits |
| Petrol and diesel oil? | Avoid | Different additive packages — not recommended |
| DPF and non-DPF oil? | No | Non-DPF oil will contaminate the DPF — change immediately |
Frequently Asked Questions
Why would I need to mix oils?
The most common scenario is an emergency top-up when your usual oil isn’t available. In this case, any oil is better than driving with critically low oil.
What happens if I accidentally mix synthetic and mineral?
Nothing catastrophic. They’re chemically compatible. The mixture will have intermediate performance properties. Change to the correct oil at your next service.
