The 1985 Mercury Grand Marquis has a varying curb weight. It can be anywhere between 4,118 and 4,137 pounds depending on features.
Yes it will fit.
Anything's possible (...but why?)
A person should know the firing order of their vehicle. The firing order of a 1985 Mercury Grand Marquis engine is 1-5-4-2-6-3-7-8.
A grand marquis wiring diagram can be found in a Chiltons or Haynes auto repair manual.
Yes you can.
10w30 in the summer is good, and if in cold climates then 5w30 will do just fine.
Fuse panel is located below the steerign wheel to the left, under the removeable panel.
Craig Marquis was born in 1985.