I just had a flashback, a few year's ago i was working at a oil change buisness when old man Green show's up with his favorite tow truck...........change the oil and check it over he tell's us so we go ahead.....
drained the oil and replaced it with 15/40..........easy enough..........................
I took the lid off the air filter to find he had no filter but he did have a nicely dried out pike(about 2 lbs)
I informed him ......he just shrugs his shoulders
Would you like me to replace the pike with an actual air filter........no that's ok .....you sure.......
ya that truck runs fine without one..........any small rock will get sucked into the engine and be crushed up........................
Oil change complete.......out the door he goes...........