After 5 years of standing, I'm fixing up my 1994 F-150. Replacing plugs and wondering if I should add some engine oil to the cylinders to ensure good compression and reduce friction on startup. Thanks for the help. Brian
Pull all the plugs out (old ones). Squirt some automatic transmission fluid into each cylinder (one or two squirts; don't over due it). Turn the engine over by hand (with a socket on the crankshaft bolt) two to three complete revolutions. Replace the spark plugs with the new ones (gapping only if required), using anti-seize on the threads and dielectric grease in the wire boots. Then start the engine using a freshly charged battery. You may see a little bit of white smoke on startup. This is due to the tranny fluid burning off.