sulzerman Posted April 28, 2021 Report Share Posted April 28, 2021 Hi all I half filled my 2500 saloon with standard Texaco unleaded, as that was all that was available. Car misfired terrible, really thought something was wrong. I do normally use super unleaded I then filled up when I had the chance with BP ultimate 97, misfire disappeared almost immediately!! Car ran far better. A bit stressful, as on a week's holiday away from home!! Anyone else had this? Motto of this story, avoid Texaco unleaded!!! Link to comment Share on other sites More sharing options...
JohnD Posted April 28, 2021 Report Share Posted April 28, 2021 What's your compression, Paul? Texaco unleaded claims 95 octane, whereas they do a 97, and Shell V-power is 99. Modern fuel is prone to ageing, and I have 10.5:1 CR. With old fuel I can get pinking, although not a misfire, that a fresh fuel fill-up will abolish. 1 Link to comment Share on other sites More sharing options...
sulzerman Posted April 28, 2021 Author Report Share Posted April 28, 2021 Sorry posted this twice!! Don't know CR but head has been skimmed, also Chris Witor up rated cam fitted Link to comment Share on other sites More sharing options...
Steve P Posted April 29, 2021 Report Share Posted April 29, 2021 Anything other than Shell V Power (99 oct) in my 2.5 Vitesse and it pinks and runs on terribly.CR is 10:1. Steve Link to comment Share on other sites More sharing options...
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