Quote:
Originally Posted by JohnM.
I'd bet it's the guides/seals over the rings....
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second that. They harden with age.
If you have no idea about the maintenance history, then the next potential culprit could be sticking rings due to sludge buildup. This is best treated over time with high-detergent oils (usu. synthetic) and frequent oil changes.
But remember, your usage is hardly bad. Well within normal, so your mechaninc would have had no reason to check further.