Petrol in a Diesel Car
Probably the worst scenario (sorry if this one’s you), is petrol in a diesel. It’s not something to take lightly and can have pretty serious consequences if you’re not careful.
If you’ve put petrol in a diesel car, here’s what to do.
Diesel in a Petrol Car
Generally it’s pretty hard to get diesel into a petrol car because the diesel nozzle is physically too large for most petrol spouts. This is a deliberate manufacturing choice to prevent this kind of mix up, but if you’ve managed to get petrol in there—it’s not the end of the world.
If it’s only a small amount of diesel, generally speaking you should be ok. Please don’t take that to mean we think you should ignore it. Diesel will cause your car to run smoky, and can cause premature fouling of components, which can cost you money in needing to replace things like spark plugs, fuel injectors and clog your exhaust system.
91RON in a 98RON only car
Putting the wrong grade of petrol in your car can actually be a pretty big issue. Many late model cars are specifically designed to run on higher grades of petrol, and trying to operate them on lower grades can cause issues. You might notice your car won’t run properly, with a shaky idle or strange noises (pinging and knocking) from the engine itself.
There are solutions to this, such as adding an octane-booster to your fuel tank. In many situations, it’s not advisable to run a late model performance car on the wrong petrol, the strain caused by the poorer grade fuel can cause long term damage. Premature wear to components is also a concern, something that might cost you big time at your next service.