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Going back a few years ago, I owned another make of V8 with increased compression over standard. The engine would ping noticeably and loudly with Shell 98 octane. However it ran beautifully with either BP 98 or Mobil (7-Eleven) 98. Even though my M3 V8 seems to run OK with Shell, ever since that earlier experience I've had a doubt about Shell in the back of my mind and have used it only as a last resort. My S65 with BPM Stage 1 tune gets BP or Mobil 98 with no issues.
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