PeteVX:
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I believe it was someone on this site that recommended changing the PCV every other oil change ..... might be good advice. Again, not sure whey the PCV requires this much attention, but I plan to replace mine often.
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Also - keep an eye on the EGR valve - and the related 'plumbing'. I have been told this is an area that can lead to trouble when it is not functioning properly.
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t2p