[Paul Glasson]

I see I wrote my leaded and unleaded wrongly in places. My problem as most people picked up was having to use leaded. Even in lower compression ratio cars such as the VW beetle I had in the old days I used to get 'pinking or pre-ignition' from using 95 instead of 97 octane. At higher altitude in Johannesburg they can get away with 95 octane. I was in the states for about 9 months in 1981 and cannot remember what the octane rating was.I am interested to hear what the rating is in the UK.We sometimes refer to super (97) and premium (95) and of course it is called petrol not gas. Gas is something in the vapour form, not liquid.
I am interested to hear from Roger and Makis that my "tractor" can run without the O2 sensor. My Porsche agent wanted to change the O2 sensor when I was getting stop/go cutting out problems, but it certainly was not a rich running problem. However that turned out to be a reference or speed sensor bad plug connection.
The tractor is fully imported here and the booklet that comes with it refers to the O2 sensor and cat so I assume they are there.