My opinion is just that,my opinion, but it is based on what I've seen in the past, 2 instances come to mind:
#1:when I dirt track raced in the early 90's,at the end of the 7 month long season, I would pull the engine and go thru it,freshen it up for the upcoming season....one year I ended up running some races at other tracks after our season was over, by then hunting season had started so I parked the race car.4 months later I pulled the engine to freshen it,when I tore it down there was
oil clinging/hanging on every part,it was literally dripping from the cam/rods/crank,basically everywhere.........Back then I used 10/30 Valvoline with a can of STP
oil additive added in on every
oil change, can't say the STP had anything to do with this, but it couldn't hurt...
#2: About that same time frame, I bought a 65 Mustang,289,2 barrell engine in it for parts,pulled the engine with unkown mileage and sat it under my shed. took the parts I needed off the car and put everything else up for sale...I know this engine had not been run in at least one year, probably longer...well, a guy comes by to buy it, he was checking it out and pulled the dipstick, it was full of jet black oil, then he wanted to pull a valve cover,I told him to have at it, then he wanted to turn the engine over to make sure it wasn't frozen, I got out a 1/2 drive rachet and the correct size socket for the crank bolt,the guy turned the engine over three times by hand and on the third rpm, there was oil coming out of the pushrods........I was suprised to say the least and he bought the engine right there.....
Putting in a pre-oiler is fine if one wants one,we're just saying it is not as needed as some may believe....how many cars are on the road today???? how many sit for weeks or months without being started???? How many come from the manufacter with a pre-oiler??????
David