Australian Unleaded Fuel 91, 95 or 98? - Mazda CX3 Forum
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post #1 of 17 Old 06-15-2016, 04:53 AM Thread Starter
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Australian Unleaded Fuel 91, 95 or 98?

Manual says use use 91. I've been using that for 8000kms now no issues. Today in a moment of forgetfulness I filled up a half-empty tank with 98. I used 98 in my old car. I understand this will not harm the car and just my wallet?
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post #2 of 17 Old 06-15-2016, 07:37 AM
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As I understand it, putting 98 in does no harm at all. A tank of it now and then may even help in cleaning the engine. I used to do that on my previous Mazda 1.8 Astina mainly to see if it gave better mpg (Ltr/100km). Never noticed any difference.
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post #3 of 17 Old 06-15-2016, 12:10 PM
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Yep putting higher octane does not harm the car. It's only the other way, if your car requires 98 and you fill it up with 91, you lose power and get engine knock.

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post #4 of 17 Old 06-25-2016, 09:04 PM
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I run Shell V-Power 99 octane here in Denmark. I have the last 4 years running with V-Power in my Honda Civic with a good result, but maybe it is a big bogus ;-)
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post #5 of 17 Old 06-26-2016, 09:51 AM
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Originally Posted by bjn View Post
I run Shell V-Power 99 octane here in Denmark. I have the last 4 years running with V-Power in my Honda Civic with a good result, but maybe it is a big bogus ;-)
I use shell v power diesel too. What I'm not sure about is what the different grades mean in Australia and the US. Are they just octane and cetane boosters or do the higher grades get all the additives for cleaning and anti-foaming that our high grade fuel gets? Anybody care to comment?

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post #6 of 17 Old 06-26-2016, 10:54 PM
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I use shell v power diesel too. What I'm not sure about is what the different grades mean in Australia and the US. Are they just octane and cetane boosters or do the higher grades get all the additives for cleaning and anti-foaming that our high grade fuel gets? Anybody care to comment?
My technical knowledge on this is pretty poor! But I know we use the same RON system in Australia to calculate the octane rating as in Europe. They are advertised as containing the additives for cleaning and anti-foaming.

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post #7 of 17 Old 06-27-2016, 01:35 AM
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Originally Posted by drs88 View Post
My technical knowledge on this is pretty poor! But I know we use the same RON system in Australia to calculate the octane rating as in Europe. They are advertised as containing the additives for cleaning and anti-foaming.
Interesting. Same in the US anybody?

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post #8 of 17 Old 06-27-2016, 01:49 PM
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I believe it is just octane rating in US. Companies may add their own additives or whatever like Shell V Power.

https://www.exxon.com/en/octane-rating

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post #9 of 17 Old 06-28-2016, 02:45 AM Thread Starter
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Thanks everyone
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post #10 of 17 Old 02-21-2017, 10:11 AM
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I have always used 98 in all my petrol cars regardless of the manual book. I feel i get better mileage and a bit more power. Engine stays cleaner too...
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