Any updates?
I have the same vehicle and have the rattle at start up which is a little concerning.... Especially now.
Did you ever find out where the anti drain back valve is? Filter doesn't have one.....
I've also seen pictured showing the defective timing chain tensioner. The ratcheting teeth wear out so it doesn't keep tension on the chain when the oil pressure drops.
Was debating weather or not to do a UOA in the spring with the oil change. Now I've decided it's definately happening.
Sorry to hear about all the troubles you're having. Definately sucks and super frustrating. I'm hoping I have a better experience with ours. 128,000 kms on the clock right now....