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S3. Just changed my plugs with NGK Iridium; checked the gaps and tightened to the correct torque. Engine started up fine but has an almost imperceptible pop occasionally from the exhaust which I’m assuming is due to unburnt fuel so it’s making me think about what it could be. Anyone...

Bought a 67 S3 a few weeks ago with "full Audi service history" which apparently equates to just engine oil & filter changes, and a pollen filter change. It's on 70k so I suspect (and hope!) that the previous owner has done some fluid changes his/herself. Main point is I had a quote from an...