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Home > Articles > Know your RON - The Difference between RON92, RON95, RON97 and RON99

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WHENEVER you pull up at a service station to fill up the tank, the number that matters most is the price of the petrol.

But of late, a number that has been attracting nervous attention is RON95, a new petrol grade that will be launched officially on Sept 1.

While RON, or Research Octane Number, has been around for a long time, especially in the form of RON92 and RON97, most motorists don’t pay much attention to it.

For the uninitiated, octane numbers refers to the ability of the fuel to resist self-igniting in the combustion chamber before the spark plug fires. If that happens, the engine will experience “knocking” and become rough; this could possibly damage the engine over time.

Petrol that has a higher RON rating (or number) will have a stronger resistance to causing knocking compared with petrol with a lower RON rating.

But do all engines need to use the fuel with the highest RON rating? The answer is a simple no.

According to Chevron product engineering manager (Asia-Pacific) Greg Engeler, all engines are designed to run on the minimum RON rating petrol recommended by their manufacturers.

“If your manufacturer specifies that the minimum requirement is RON95, using RON97 will not harm the engine. But you might end up paying more without getting any gain in performance.

“However, using fuel with a lower-than-recommended RON rating can cause engine damage,” he said at a media briefing on RON95 at the company’s Pulau Indah installation in Port Klang recently.

Come Sept 1, RON92, now priced at RM1.70 per litre, will be phased out and replaced by RON95, which will cost 5 sen more.

The other grade, RON97, will continue to be sold but its price will be increased by 20 sen per litre to RM2.

To know your car’s RON rating, just look up the owner’s manual or at the inside of the fuel lid of your car’s fuel tank.

Engeler said modern engines with knock sensors could run on fuel with a low RON rating, as the engines can adjust their spark timing automatically to eliminate the knocking.

“However, the car’s fuel consumption, driveability, and power may be affected,” he said.

Using the right RON rating fuel based on the engine’s design and tuning will maximise vehicle performance.

Engeler said about 84% of petrol sales in Europe is that of RON95 and 85% of sales in Japan are RON89 and RON90.

“Since the majority of cars in Malaysia are using engine technologies from Europe and Japan, the introduction of RON95 should not pose problems for local motorists,” he said.

Proton, whose cars easily form the bulk of the passenger cars on local roads, says that all its models, whether fitted with carburettor or the latest Campro CPS engines, can run on RON95.

However, the Malaysian car maker did indicate that some of its earlier carburettor-equipped models, depending on the condition of the engines, might experience some knocking.

Owners can solve the problem by getting the ignition timing of their cars adjusted at Proton- authorised service centres.

Perodua cars are even better off, with most models already tuned to run on RON90, meaning that owners can save 10 sen by using RON92 instead of the more expensive RON97. Again, if in any doubt, refer to the car’s manual.

Even imported cars like Toyota and Kia are ready to run on RON95.

Chevron Malaysia country chairman Jeremy Oh said owners do not have to wait until their tanks are near empty before filling up with RON95 petrol.

“Fuels of different RON ratings can be mixed safely without causing any harm to the engine,” he said.

He also said many owners whose vehicles could operate on RON95 or below were using the more expensive RON97.

“The higher RON number does not mean that the fuel is more powerful. Vehicles that require a higher octane fuel are usually sports cars or those with turbocharged engines.

“In any case, RON97 will still be in the market if your vehicle really needs fuel of that grade to perform at peak performance,” he said.

Chevron Malaysia, which has over 420 Caltex service stations around the country, will be offering RON95 at selected service stations even before the official switch-over to RON95 on Sept 1.

Sources: http://thestar.com.my/lifestyle/story.asp?file=/2009/7/5/lifefocus/4229798&sec=lifefocus


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