On 08/29/2015 10:47 AM, Muggles wrote:
I've heard that older vehicles are held together by the old oil and if
you change it the motor thinks the world is coming to an end and won't
start any more.

how old is old? Back before detergent oil you definitely didn't want to
stir the **** up. Back when you adjusted valve clearance, I've pulled
valve covers to find what looked like a thick coating of grease.
suddenly introducing them to detergent oil wasn't a good idea. I think
that's where the paranoia about going from dino to synthetic came from.