Engine tick and vibration

Ticking noise on mine was rockers/lifters. Vibration only at 2k? Perhaps the harmonica balancer is slightly off balance? Oil leak from where? Or what area?

I replaced them. The rollers on the lifters were bad. Scored the cam, but I was able to polish the lobe. Happens more on the passenger side, oil goes there last. I replaced the lifers while I had the rockers off, just to be sure they weren't a problem. I hope to get caught up with the Honey Do Home update by Fall and replace all the rockers and lifters. Balancer, Clutch, Flywheel and even misfire could cause the vibration. I don't recall that being a common "this is the fix" problem. Oil Filter - Long ago, the filter I pulled off a car my sister had left the gasket on the block. So when I put the new filter on, it was double gasketed. That leak, but it was a very noticeable leak, I fixed it right away. It would be nice if changing the filer would fix it.

I believe that has a dual mass flywheel and it's probably going bad. I had the same thing at 85K on my v6 and I changed it over to a single mass flywheel and all vibrations went away.