RON 95 vs RON 97: Does Premium Petrol Keep Your Engine Cleaner?

RON 95 vs RON 97: Does Premium Petrol Keep Your Engine Cleaner?

Walk up to any petrol station and you'll face the same small decision every time: stick with RON 95, or pay extra for RON 97. Many drivers assume that paying more for "premium" fuel automatically means a cleaner, healthier engine over time. But is that actually true, or is it a myth that's costing you money every week?

Let's break down what octane rating really does, what it doesn't do, and the more cost-effective way to actually keep your engine clean.

What Does Octane Rating Actually Measure?

RON stands for Research Octane Number, and it measures a fuel's resistance to knocking, a form of abnormal, uncontrolled combustion that occurs when fuel ignites too early or unevenly inside the cylinder, rather than in a smooth, controlled burn.

Higher-performance and higher-compression engines are more prone to knocking, so manufacturers of these vehicles often recommend RON 97 to keep combustion stable. For most everyday cars, though, RON 95 already meets the octane requirement the engine was designed for.

In short: octane rating is about combustion stability and knock resistance, not cleanliness.

Does RON 97 Reduce Carbon Buildup?

This is where the myth starts to break down. RON 97 may burn slightly more smoothly in engines that need higher octane, and some RON 97 blends include a marginally higher concentration of detergent additives. But here's the key point:

No petrol grade, RON 95 or RON 97 is designed to fully prevent carbon deposits from forming.

Carbon buildup happens because no combustion process is 100% complete. Regardless of which fuel grade you use, microscopic traces of unburned fuel and oil will still stick to your fuel injectors, intake valves, and combustion chamber over time, gradually hardening into deposits. Premium fuel might slow this process down slightly, but it does not stop it.

This means that even drivers who consistently pay extra for RON 97 will still experience the classic symptoms of carbon buildup over time: reduced fuel efficiency, sluggish acceleration, rough idling, and higher emissions.

The Real Cost Comparison: Premium Fuel vs. Dedicated Treatment

Let's look at the actual cost difference.

• Paying for RON 97 every week means an ongoing price premium on every single litre, every single fill-up, for as long as you own the car with only a marginal (if any) impact on carbon buildup.

• Using a dedicated fuel system treatment like BioFuel periodically targets the actual cause of the problem: the carbon deposits themselves, directly loosening and clearing them from your injectors and valves.

Instead of paying a small premium on every tank indefinitely, a fuel system treatment lets you spend a one-time, low-cost amount only when your engine actually needs a clean, offering a far better return per ringgit spent on keeping your engine efficient.

So, Which Should You Choose?

If your car's manufacturer specifically recommends RON 97 (common for turbocharged or high-compression engines), you should generally stick with it to avoid knocking and protect long-term engine health. But if you're using RON 97 purely in the hope that it will "keep your engine cleaner," you're likely paying for a benefit it isn't really delivering.

A more cost-effective strategy for most drivers is to:

1. Use the RON grade your manufacturer actually recommends (check your owner's manual).

2. Periodically treat your fuel system directly, rather than relying on fuel grade alone to manage carbon buildup.

BioFuel is a plant-refined bio-oil formula designed specifically for this purpose. It works through natural atomization and lubrication to loosen and clear carbon deposits from your fuel system, without the harsh chemical stripping used in many traditional cleaners. Available in petrol and diesel formulations, it's a simple, low-cost step you can take alongside or instead of paying extra for premium fuel every week.

If you're chasing a cleaner engine, treating the actual cause is a smarter investment than paying for octane you may not need.