This video link is my engine sounding during cold start. It sounds like this every time I cold start it. I took it to the dealer 2 weeks ago, left the car overnight so they can hear the engine at cold start and I’m sure you can guess what happened next. The advisor called me a few hours after the dealer opened and said they couldn’t duplicate the noise. I told him “What do you mean you couldn’t duplicate the noise. It does it every time I cold start the car. I showed you in the videos” I have 4 different videos I showed him of the engine tapping away. So upset I took the car home parked it in my driveway let it cool down waited about 8 hours, started the engine and voala,, it started tapping... Apparently the guy who checked my car had hearing problems or a case of the” I’m not chewing another engine bone” syndrome, hey, I get it,, I work at a Toyota dealership parts back counter myself and hear the techs talking about batting stuff away that they don’t want to do.. Well any how I was reading all over the web how other 2018-2019 owners are going thru similar situations with engine noises some having short blocks replaced and others having complete long blocks some have said they were on their 3rd engine and had engine noise after 3-400 miles. I didn’t want anyone touching my engine to have a bunch or parts thrown at it to still keep making noise so I started playing with the different grades of engine oils to see which one it sounded the least. Figuring that the performance pack ran a 5w50. That would be my last choice. I tried 5w20PUP full synthetic, motorcraft 5w20 semi synthetic, 10w30PUP full synthetic, motorcraft 5w30 semi synthetic and finally Mobil1 0w40.. So far with the Mobil1 0w40 it’s made the least noise. It had a very faint tick at start up so I added the miracle additive “Ceratec” to the 0w40 drove it for 10 miles or so it circulated well and so far it’s been 3 days and absolutely no noise what so ever. It sounds like a new engine. “In my case” 0w40 and Ceratec worked for me which leads me to believe “In my case” it’s not injector related, it’s something internal in the engine because why would it go away with thicker oil and an additive. Regardless, I’m happy as hell,, no noise. This time if it comes back I’ll put back 5w20, take it to the dealer, park it outside in the customer parking, take the keys home with me, come back the next day and have the service manager, advisor, tech and myself go the the parking lot and all have a group listen of my engine tapping away to see if no one hears it this time..