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Is It Okay To Mix Different Petrol Brands And Petrol Grades?


Lea S

25 Feb 2021


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Image via prostooleh/Freepik

We all have a petrol brand that we’re loyal to. However, there will come a time when you’ll need to fuel up somewhere else because there’s no other choice. And while you do it, you may have wondered, “Actually, can or not ah to mix petrol brands? After my car spoil how?”

To answer this question, we reached out to Christopher Ng, the editor of Behind The Wheel, who revealed that yes, you can mix petrol brands without damaging your car because petrol from any of the major brands are pretty much the same. However, sticking to one means you get to rake up loyalty membership points every time you fuel up.

According to Ng, you can also mix petrol of different grades such as RON95 and RON97.

Image via Hari Anggara/Malay Mail

RON is short for ‘Research Octane Number’, which is a number that’s used to rate the quality and performance of fuel. The higher the rating, the higher level of compression it can withstand… and that usually means more power output. In Malaysia, RON95 is considered as ‘regular’ unleaded fuel, while RON97 and RON100 are more premium variations.

Before you start randomly feeding your car with a petrol cocktail of your liking though, here are two golden rules to remember:

  • Never ever mix petrol and diesel
  • A higher RON isn’t always better—it depends on your engine

There’s a minimum fuel grade requirement for every engine—you can check with your car manufacturer or service manual about this. Using a petrol grade that’s lower than the one required can lead to damaging results in the long run.

On the other hand, every engine has its maximum limit, so fueling up on a higher petrol grade may not necessarily help—there’s only so much speed and performance a specific car can deliver.

Image via Alwin Kroon/Unsplash

Engines in most ‘everyday’ cars—think Myvi, Vios, Honda—are tuned to burn RON95 efficiently. Meanwhile, if you’re driving a sports car, super car or a hot hatch, your performance engine will require RON97 at the very least. Note that there are also some cars that need to run on RON100 so it’s best to check.


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