Premium Unleaded

2955 Views 5 Replies 4 Participants Last post by noahe, Mar 3, 2002

Basil

Discussion Starter · Mar 2, 2002

Okay, the only thread I could find by doing a search was in the vault, so not much point in going into the dungeon to ask a question.

Does anyone know for sure whether the Cooper S:

a: Will run on Unleaded fuel

b: Require Premium (98+RON) Unleaded fuel

or

c: Runs on standard low octane Unleaded but will have improved performance (active knock sensors etc) using Premium Unleaded.

Again profuse apologise if this has been raised recently, but the search engine didn't find it.

Perhaps Paul will be able to ask someone at his forthcoming drive.

cheers

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Basil

Discussion Starter · #2 · Mar 2, 2002

ok. just checked out MINI2.COM's data section, and indeed it states there that the S will run on 91 to 98 RON.

Cool !!.

And thanks for the info MINI2

PS. Not supposed to be here.......zzzzzzzz

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BrantV

· #3 · Mar 2, 2002

In the US brochure, it lists the fuel requirements as Unleaded (premium recommended)

HTH,
Brant

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Basil

Discussion Starter · #4 · Mar 3, 2002

BrantV said:
In the US brochure, it lists the fuel requirements as Unleaded (premium recommended)

HTH,
Brant

Does it !!!..... Geez, i've got five of the things and didn't find that bit.....

thanks

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nwoodiwiss

· #5 · Mar 3, 2002

RON vs Octane?

Hey Guys, help me here...in Canada we use Octane...what is 91-98 RON in Octane?

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noahe

· #6 · Mar 3, 2002

Nick,

RON stands for "Research Octane Number" which is determined with a test engine running at a low speed of 600 rpm. This seems to be the kind quoted by the europeans.

A "Motor Octane Number" or MON is another index in a test engine running at a higher speed of 900 rpm. This is the preferred test for North American markets.

The most frequently seen number in Canada is the Gas Pump Octane number. This is sometimes quoted as "(R+M)/2" in manuals or publications, but I doubt you'll see it anywhere on the pump. It is an average of the two ratings. If, for example, a gasoline has an RON of 98 and a MON of 90, then the posted octane number would be the average of the two values or 94.

You need to see what RON, MON or (R+M)/2 your car calls for, and then work out what pump grade is closest to that.

If there's no exact match, depending on who you ask, you should either go a point or two over the rating, or under. There's no good answer. Too low, your engine knocks, too high and you blow an O2 sensor or risk burning other things.

I found this on my first quick search:

"High octane gasoline does not outperform regular octane gasoline in preventing engine deposits from forming, in removing them, or in cleaning the engine. Consumers should select the lowest octane grade at which the car's engine runs without knocking. Occasional light knocking or pinging won't harm the engine, and doesn't indicate a need for higher octane. On the other hand, a heavy or persistent knock may result in engine damage."

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