I get the dealer to do it every 3rd service. It isn't terribly expensive, and im too old to fanny about under a car up on drive-on ramps. They've some way of doing it with minimal disturbance of the exhaust, but I've never enquired as to the minutiae of their particular process.
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2005 C70 2.4T Collection convertible. 40,000 mile sunny day toy.
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