When they start, with the aluminum timing case now, they sound like the crank is in a barrel of marbles. My ex-wife's d*mn near scared me on cold start ups.I find my 2017 2.5 engine quite noisy, especially on a cold start. High revs, fan noise if ac on. much louder than some cars.
I work in the Chicago area and my family is in the Pittsburgh area. Our new car (17 OB 2.5 picked up on 07/29/17 from a Chicago area dealer) did not make any unusual (example above as "barrel of marbles") sounds during start-up. It sounded typical and I did not pay this any attention. I drove it for 3 to 4 days in the Chicago area and then my family drove it to Pittsburgh and it has been there since. During Labor Day weekend, I went to PA in our 2008 OBS and heard the 17 OB start-up and made a mental note to watch it. It sounded clattery for the first second or two before settling down. It had been sitting for a couple of days after being washed as I was going to install the BS molding kit. Hence I did not pay much attention to the sound. However, the next day, heard similar sounds during start-up. Even though the car had only 960 miles, I decided to change the oil and filter (I had done the same with our new 2008 OBS at ~1000 miles when new. Note that our OBS does not make a clattery racket during start-up, but starts up smooth; now at ~117K miles. I use either Pennzoil Platinum HPZ-37, or mostly Fram Ultra XG6607 filters on the OBS). I had already ordered Pennzoil Platinum 0W-20 motor oil and Purolator Boss PBL14615 filter (this is shorter in height vs. the original blue filter that came from the factory; will investigate taller filters next time) for the 17 OB and hence had what I needed. Added oil to the filter (~3/4 of height) and rotated the filter ~horizontally by hand. The filter element soaked the oil up; added another ~1/2 height level quantity of oil and the filter easily soaked the oil up. Then installed the filter and added the remainder of oil; total of 5 quarts. We may have to add another 100 mL or so, but it was OK. Started the car up and it ~instantly smoothened out. My wife has been keeping an eye out for unusual sounds during start-up and reporting back that there is no clattery sound anymore during start up.When they start, with the aluminum timing case now, they sound like the crank is in a barrel of marbles. My ex-wife's d*mn near scared me on cold start ups.