Planet-9

Need some octane rating information

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YOUR RESEARCHNeed some octane rating information

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Check filler cap and it says

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I just checked the filler cap and it says to use (R+M)/2=93, NOT RON=93.
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Need some octane rating information

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Leading evidence: 'Check filler cap and it says' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check filler cap and it says' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

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Use 91 all the time

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My normal CS driving is spirited during the weekends so I use 91 all the time.
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Need some octane rating information

Use premium

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For the small difference in price and the fact that I drive it less than 4000 miles a year, I use the premium.
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Need some octane rating information

Use right stuff

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It also makes it easier to be sure I am using the right stuff.
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Need some octane rating information

Run 89 in a cayman

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Suggestion
Anybody have any actual experience running 89 in a Cayman?
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Need some octane rating information

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Check filler cap and it says

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I just checked the filler cap and it says to use (R+M)/2=93, NOT RON=93.
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Need some octane rating information

Run 89 in a cayman

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Suggestion
Anybody have any actual experience running 89 in a Cayman?
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Need some octane rating information

Run 89 in my cs anytime i am not going

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Suggestion
I run 89 in my CS anytime I am not going to the track and the car runs great.
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Need some octane rating information

Run 93 in my boxster

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Suggestion
I only run 93 in my Boxster.
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Need some octane rating information

Run worth a damn

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Suggestion
My son had an AMG MB that wouldn't run worth a damn on 89.
Original post Read captured discussion
Need some octane rating information

Use (r+m)/2=93, not ron=93

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Suggestion
I just checked the filler cap and it says to use (R+M)/2=93, NOT RON=93.
Original post Read captured discussion
Need some octane rating information

Use 89 (r+m)/2

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Suggestion
That was great when I needed 91 RON and used 89 (R+M)/2, but it is getting a little close to the edge if I need 93 RON.
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Need some octane rating information

Use 91 all the time

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My normal CS driving is spirited during the weekends so I use 91 all the time.
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Need some octane rating information

Use 91 if i am going

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Suggestion
I can always use 91 if I am going to the track, but what about normal day-to-day driving?
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Need some octane rating information

Use of these fuels in your vehicle

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Suggestion
the use of these fuels in your vehicle.
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Need some octane rating information

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6 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

Planet-9: 1 discussions

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POST 1Original post

The Cayman R calls for 93 RON, but of course we have (R+M)/2 here. My rule-of-thumb has always been that the RON will be about four points above the average. That was great when I needed 91 RON and used 89 (R+M)/2, but it is getting a little close to the edge if I need 93 RON. My son had an AMG MB that wouldn't run worth a damn on 89. Anybody have any actual experience running 89 in a Cayman? I can always use 91 if I am going to the track, but what about normal day-to-day driving?

POST 2Original post

My normal CS driving is spirited during the weekends so I use 91 all the time. I have never considered using anything lower since I do not drive her often enough to care about the price differential.

POST 3Original post

I only run 93 in my Boxster. For the small difference in price and the fact that I drive it less than 4000 miles a year, I use the premium.

POST 4Original post

You are correct on the research vs motor numbers, the research is generally 3 - 6 points over the average. I run 89 in my CS anytime I am not going to the track and the car runs great. I really can't tell any difference.

POST 5Original post

I was slightly mis-led. I just checked the filler cap and it says to use (R+M)/2=93, NOT RON=93. That makes a big difference. It also makes it easier to be sure I am using the right stuff. I won't have to mentally convert.

POST 6Original post

Here's what the Owner's Manual says (p. 219 of 2007 OM): "Your engine is designed to provide optimum performance and fuel economy using unleaded premium fuel with an octane rating of 98 RON (93 CLC or AKI). Porsche therefore recommends the use of these fuels in your vehicle. Porsche also recognizes that these fuels may not always be available. Be assured that your vehicle will operate properly on unleaded premium fuels with octane numbers of at least 95 RON (90 CLC or AKI), since the engine’s ”Electronic Octane™ knock control“ will adapt the ignition timing, if necessary."

This is a source reference. Confirm exact model applicability in the original material.