Is it true that this is 99 ron and can be used in a car without a cat converter???

 

The old 4-Star was 97 RON, down from 98, so the same or lower RON than some super unleaded and will poison any sensors.

 

Not recommented then eh??

 

back in the 70's my old fella had a vw passat that needed 5star petrol
which was withdrawn in the mid 70's ish iirc(i was only 5 at the time)
any one remember the ron ratings for 2,4+5 star petrol?

 

5* was 100RON I think. 4* is difficult to find; only a few garages are licensed to sell it(and its crap anyway). Major manufacturers used to use SUL for LRP though. LRP was always a good deal cheaper, mostly its been withdrawn now though.

Simon

 

You can still get leaded petrol, used to run my tweaked Alfa 33 on it a few years back. http://www.leadedpetrol.co.uk/index.html 99.7 RON according to the website, trouble is I found it too often contained crap (probably due mainly to low turnover) which blocked jets in my carbs, eventually decided that Optimax did the job and saved a lot of hassle so switched.

Edit - sorry GCB didn't read your post - but I do have to say when jets weren't blocked it was a bateer fuel for my car than Optimax.