This issue is just like my intermittent hard starting. It’s so sporadic and there’s really no rhyme or reason behind it. Other than maybe every 5-6 start ups I’ll get lifter tap for about 3 secs upon start ups and then it goes away. The engine runs flawlessly otherwise. And I always let it cool down after a hard run and it did it with the factory oil and also the PUP that I’ve been running for 2500 miles now. Anybody else having the same issue ?