I changed the oil in the Uplander about 400 miles ago to Mobil 1 Advanced Fuel Economy 0w30. The engine has never ticked before but just over this last week I have noticed it has a single tick that is loudest on the first start of the day, it quiets down after it warms up some, but is always there. Never ticked before, just started about a week ago. Im hoping this is not a serious problem. Could the Mobil 1 have caused this? I know the oil didnt break anything but could it cause such a noise? Im going back to SOPUS next OCI for sure, Mobil 1 has not impressed me at all, overall the engine is noisier with this oil and now this. Probably going to use Quaker State Ultimate Durability or Pennzoil Platinum 5w30 next time around. Might even consider Pennzoil conventional. I want to keep using syn in this van but if dino would stop this noise I'd go for it. But before dino Ill use Pennzoil Platinum or Quaker State Ultimate Durability to see if it stops. What are your thoughts on this...wish I had a video, Its not a fast tick, ticks about 2 times per second if you can imagine that, and you can here it best with the hood open looking down on the engine, its the Chevy 3.5 push rod, no vvt.