924Board.org

Paul · Posted: Sun Feb 10, 2008 12:09 pm Post subject:

From: http://www.btinternet.com/~madmole/Reference/RONMONPON.html

In America the service stations use the Pump Octane Number or PON rather than RON. this is the average of RON and MON and gives a much better grade, and is also why the American gas always seems not as good as our when in fact it is is the same (and has better quality control). But even this system can be abused by adding octane boosters to poor fuel.

Below is an approximate comparison chart, these numbers can vary by as much as 2 grades

RON MON PON
90 83 86.6
92 85 88.5
95 87 91
96 88 92
98 90 94
100 91.5 95.8
105 95 100
110 99 104.5

[/url]
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

Nobbi · Joined: 24 Aug 2006 Posts: 1396 Location: Germany

..different engines with different compression rates?My euro 77 needs and gets 98 Octane "Super Plus" (Lead free).

Nobbi

Paul · Posted: Mon Feb 11, 2008 12:58 am Post subject:

Based on the chart above and the stickers on the gas caps, both the red car and the black car will run fine on US 87 Octane or 91 Octane in Europe (assuming it's RON over there).
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.