It could be the valves. Our valves are already loud, and with a cold start, and not having the oil there right away, that could cause more noise. I think that thicker oil your using could be part of it.
98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)
FS: SVT rear sway bar
WTB: Very cheap beater
CEG Dragon Run - October 13-15