I flew an earlier series of the type you operate (for DL) in the Navy, great aircraft even in the 1974 vintage.
Strictly part-time now in the KC-135 along with a few odd hours each month backing-up a G400 crew.

 

I Have a 2003 Chevy Venture with a 3.0 V6 engine. Im also hearing a ticking sound on the engine and it wouldnt stop, I mean the whole day im using the van. need help! tried changing the oil to castrol 20W-50. the sound went down but the ticking sound is still there. im from the philippines thats why i tried using the 20w-50. you think a synthetic oil will keep it quiet?