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Basically, you should use the fuel recommended by the owner's manual. That is the fuel the engine has been designed to use.Varying the octane rating is not necessarily a good idea. High octane fuel has additives to slow down the combustion process and make it less likely to detonate or explode, you don't ever want that happening in your engine. It is a fuel made for high performance engines that are built with high compression ratios and also modified exhaust valves, usually stellite treated.Stellite referenceStellite - Wikipedia, the free encyclopediaHigh octane fuel, can still be burning as it leaves the engine and therefore highly stresses the exhaust valves, which if not stellite can be damaged by excess temperature, causing valve collapse and failure.So, for me, I would just fill with ULP and leave it at that. Brand is a personal preference, so it comes down to what additives are in the fuel. Any of the reputable marketed brands should suffice, but always buy from a high turnover servo, as the fuel will be fresher and less likely to contain water.
Now, apparently 91 is withdrawn, the article states to enhance sales of e10 type fuels. Not sure if that's the case in your state. In SA, E10 is specifically marketed as a separate product as distinct to ULP.
I find that 91 is usually available from independent branded places only these days. There are a few of these in my area and tend to use it. I also use E10 and don't find any difference other than slightly better economy with it. Most big brands don't seem to offer any 91 so it's either E10 or premium from the major players.
I agree that you should go by the manual regarding using 91 unleaded fuel or 95. I seem to have two choices ,after studying the manual and other booklets given to me by the dealer the Hyundai manual states the same as VaerO's post use 91 and the dealer I bought the car from James Frizelle's own booklet states they recommend petrol engines use 95 octane premium fuel :
Quote from: John B on May 03, 2014, 13:33:28I agree that you should go by the manual regarding using 91 unleaded fuel or 95. I seem to have two choices ,after studying the manual and other booklets given to me by the dealer the Hyundai manual states the same as VaerO's post use 91 and the dealer I bought the car from James Frizelle's own booklet states they recommend petrol engines use 95 octane premium fuel : From a dealer's point of view, they know they won't be troubled by customers complaining of engine knocking, by specifying 95 RON fuel. So for them, 1 problem solved. I would be interested to hear their explanation as to why they prefer to differ from the manufacturer's recommendation.
Quote from: Phil №❶ on May 03, 2014, 23:38:05Quote from: John B on May 03, 2014, 13:33:28I agree that you should go by the manual regarding using 91 unleaded fuel or 95. I seem to have two choices ,after studying the manual and other booklets given to me by the dealer the Hyundai manual states the same as VaerO's post use 91 and the dealer I bought the car from James Frizelle's own booklet states they recommend petrol engines use 95 octane premium fuel : From a dealer's point of view, they know they won't be troubled by customers complaining of engine knocking, by specifying 95 RON fuel. So for them, 1 problem solved. I would be interested to hear their explanation as to why they prefer to differ from the manufacturer's recommendation.Sound's about right Phil, Come Monday I will give the service manager a call and see what he has to say and report back.
Thanks John,Now do we know whether all 95 RON has these additives
Hence my original question, does anyone sell 91 ron fuel with cleaning agents.When I asked my dealer which fuel to used they answer with a question, how long are you planning on keeping the car?They suggested in the long term that Premium unleaded would be more better due to it's cleaning properties.If I can't find a 91 ron with cleaners maybe run a tank of premium in every 5 ???or doesn't Hyundai add an additive in the tank at service, maybe that would be enough?thoughts?
Contains an additive to keep injectors and inlet valves clean.