2015 CX-5 2.0L — Light Knocking Sound at Idle After Cold Start?

Hey everyone,

My wife and I purchased our 2015 Mazda CX-5 with the 2.0L engine brand new, and honestly, it’s been one of the most trouble-free vehicles we’ve ever owned. We’ve always taken meticulous care of it; early oil changes (2500 - 5000 miles or every 6 months), using only top-tier oil brands like Amsoil and, more recently, Pennzoil 0W-20.

For about the past year (maybe a bit longer), I’ve noticed something a little puzzling. After a cold start, once the idle comes down, there’s a faint knocking sound coming from the lower end of the engine; or at least that’s what it sounds like. This only happens at idle.

The CX-5 still drives just as solid and smooth as it always has, and it’s been a fantastic, well-built vehicle overall. We’ve since passed it down to our daughter, and I continue to maintain it carefully.

Has anyone else here experienced this same sound, or is there already a thread about this that I might have missed? I’d really appreciate any feedback or insight you might have.

Thanks in advance!
 
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