Thanks for the reference JimF

fyi-

'94 E500 (42.9k) sits in the garage .....regularly over 4 week periods of non use= no ticking on start-up. Oil? Penzoil LongLife 15w-40 (since new)/ 1500 mile change intervals

'02 C320 Sport Wagon (15k/ daily driver)= knocking/ticking noise every morning on start-up!

-fad