LMAO man the first video sounds COMPLETELY normal.....

second video alittle effy but I'mma say normal.....

Drive it dude, sounds fine to me...can you hear the "tick" inside the car???

the first video, my car sounds the same since I bought it new in 2006...now with 91K
Wash it and take it for a cruise...

your tenioner is suppost to move, normal...duno how "bad" it's moving but yes they jump alil...
I really dont see changing from syn oil to normal oil making a differnce...I dunno what all this new crap out is about with synthetic and high mileage stuff but I usually run Valvoline or Castrol...non-syn...