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Thanks for the comments. I've used a range of 98 fuels but actually found Caltex Vortex 98 to be the best. The subaru mechanic actually suggested using the Shell V Power Racing (100 octane) to fix the problem. Apart from the fact this is now discontinued, I think it is only treating the symptom and ...

Hi, My name's Rob and this is my first post to this forum. I am the owner of a new MY08 3.0R Spec B sedan that now has about 10,000k on the clock. I love the car and the way it handles. However, for the last 5000k or so I have noticed a slight ping at around 3-4000 revs under load. It is more notic...