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Unless you have some mechanical default with your distributor cap and/or rotor then you shouldn't need to replace either. Their designed to have an understandable amount of wear while still allowing the most optimal transference of potential difference to the plug.

I realize that both parts are relatively inexpensive, but what reason would you follow the books recommended maintenance only because it tells you to change out the part. In order for the parts to show any recognizable signs of duress through engine performance, you would have to have a faulty part or mechanical issue which then worries me of other, more important, engine issues. I wonder how much you would allow your wallet to be raped simply because the dealer told you any procedure was recommended.
 

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If this room was only about installation then why would you show before and after pictures of the parts? You did put in comments concerning reasons as to why it should be changed. I was just elaborating to help the "Newbs" understand "why you need to replace ... parts like this". They should be made aware that if their cap and rotor are truly in significant need of replacement then they should look towards other issues as to the cause other than simple wear and tear which would not give just cause for replacement.

For example.. A cylinder wall within the engine can be worn, but unless there's some other major mechanical issue, then it would not have to be replaced or have pistons replace simply because it is worn. If you have reason to change the pistons or sheath the cylinders then the mechanic should look for the cause of that realizing that normal wear and tear would not be the issue.

If you understood what I was saying about the "wallet raping" then you would know that I wasn't just talking about the cap and rotor, but "All recommended dealer replacement services".
 

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"cylinder wall are not expected to require replacement during the life of an engine"

This is an untrue statement. As I said before.. a Cylinder Wall is not indefinite therefore it will wear as well as Pistons, Valves, Crankshaft, Rods, etc etc which also are all moving parts that are expected to be replaced the older the engine gets.

If a Valve is bad.. do you just trash the whole engine? Of course not. You replace it.
 

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"Hence the term "expected" to need replacement"

As I also said above dealing with an expected replacement inside the engine.

Your views are clearly different than mine. If you just follow the books suggested interval changes for preventable maintenance or take the word from a certified tech for all the little things that they consider to be replaced over time then your going to run into unnecessary expenses.

Now I'll re quote my second post on this thread which is the whole reason why I had to respond.

"They should be made aware that if their cap and rotor are truly in significant need of replacement then they should look towards other issues as to the cause other than simple wear and tear which would not give just cause for replacement."
 
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