The chrome off the rockers isn't magnetic, so it won't stick to the sump plug. Any chrome collects on the gauze filter which is screwed in to the side of the engine, just below the clutch housing. Opening rockers are about £105 inc. vat, closers are about £115. It's quite common to find slithers on the sump plug. They could've been there for years if the plug hasn't been cleaned when it's been taken out. I wouldn't be over concerned unless it looks like a shim or such like. |