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Well depending on how long it's been sitting, I'd remove the spark plugs & squirt in maybe a teaspoon of Marvel Oil & let it set while I disabled the fuel pump & spark, then remove the oil filter & fully fill it if possible, then crank the engine with the starter motor to fill the oil filter if you didn't/couldn't prefill it & build enough oil pressure to turn the OP light off.
If your ****, maybe do this three or four times over an hour, to give all the lubes time to soak in & coat everything good.
Then after the last cranking session, without delay, replace the plugs, re-enable the spark & fuel pump & start er up!!!!
In my old engine-building days, while the engine was still on the stand, we'd run the oil pump with a drill motor and extension (female end removed, so it would fit in the drill motor) with a 1/4" socket on the end, until we got a pressure reading on the gauge that was temporarily connected just for that purpose. Then we'd turn the engine over by hand (spark plugs removed) with a breaker bar/socket on the crank pulley bolt until we got oil at all the rocker arms. Seemed to work pretty well and we never lost an engine, out of about 20 or so, I'd guess.
The "old days" with pre-O2 sensors, it was easy and commonplace to pre-lube engines with plugs removed as stated here.
However, on many vehicles built from the mid 80s on, doing those procedures will cause many cars to trip the "check engine" light. Then the light must be re-set, and some cars require the correct scan tool o turn off the light. So use caution and common sense on modern FI engines.
A while back I bought a pre -luber from a company called Blueprint Engines. ( Im sure alot of different companys offer them) It looks like a pressure bleader for brakes. You put the oil in and then pressurize it w/air, hook the hose up to where your oil pressure gauge would come out. With the valve covers off, wait till the oil pumps out the rockers. Has worked good so far.
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