Pete writes:

Hey Sajeev, I got one for you.

Several engines nowadays are set up to operate on half their cylinders under light-load conditions. Would the design considerations for piston rings vary from those normally used for such cylinders that are only used part-time? The question arises in the context of a 2009 V6 Accord that is currently in the Honda dealer’s shop to have the piston rings replaced at the manufacturer’s expense to cure a continual oil consumption and spark plug fouling problem.

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Jim writes:

Dear Sajeev:

I hope you are well. I have a 2011 Subaru Forester (silver/5 speed) which has been great since purchase. I have travelled 19K to date and change oil every 6 months or 7,500 miles. I have one somewhat troubling matter, however: I’ve added a quart of synthetic oil prior to each 6 month/7,500 mile oil change. (Read More…)