From the beginning I thought my 4.0 L v6 was noisy.
I chalked that up to being "a Toyota thing", as I remember a friends Camry also having a loud engine.
But now there is a noticeable Diesel sound. Reading around on the net I have seen this problem be called normal, and have seen others say it was fixed with a spark plug and oil change/flush. I know I need an oil change as I just ordered filters from eBay (Toyota brand). But I guess I'll replace the plugs to see. I just hope and pray I'm not looking at needing a top overhaul. I mean at 106,000 miles a Tacoma is still like new.