| Failing rockers
My apologies if this has been brought up before but have any of you had rocker failures in the 4 valve motors? There are a huge number of failures here in the US of the chrome contact surfaces that ride on the cams. This leads to cam lobe damage, broken valves, shrapnel in the oil, etc. Chrome flakes/strips can sometimes be found in the pre-filter. A visual inspection is the only reliable way to spot the problem and this requires the rockers to be removed, rarely done at a regular service. I haven't heard much coming from your part of the world and am curious if this problem is as prevelant over there. TIA. | 
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