with 130k miles on my TL-S, it used to make a nice smooth humming sound but recently i noticed it is more of a growling sound. Probably not a huge deal, but i certainly feel the difference. Is there a anything could be done about it?

 

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Have you kept up with regular maintenance; fluid changes, timing belt, spark plugs?

 

ck the ac tensioner pulley, that makes a funny sound when it goes out