Or maybe they had some issues with cars running 95 causing knock, its an older car chances are its ECU my not have such advanced knock control and knock sensors. E46 M3 for example can knock or ping whichever you prefer on low quality fuel. Any high revving engine, also put the best fuel you can find in it, so Vpower99 or Tesco99, not saying 95 would damage it but I put the best in all my cars, even the Clio, for several reasons: 1. Makes me feel good 2. Cleaning additives 3. More power and knock prevention.