dipstick.....
I wouldn't let them pull the motor for $110!.........that's outrageous. What gets me is it's obvious they didn't give you any help as to what you may be able to do instead.
With it being 6", chances are, it's still in the dipstick tube, unless you tried to put the stick in and pushed it down.
Go to Lowes or Home Depot. Get a small roll of "stainless" wire. If it's sold in different size gages, get one that's thin, yet thick enough to bend a hook into.
Take a piece of wire, as long as your dipstick, cut it at an angle at the tip, to cause it to have a sharpened point, then, bend it up like a fish hook. Make sure the point is still facign outward to when you push it down into the dip stick you may be able to hook into the plastic and pull it back out.
I know we have a manual for pulling your engine. Let me go look at the exploded view and see where this (6") plastic tube will be and what, if any, damage it will do.
Be back in a minute to edit this post.
O.K.....I just looked at the manual on this problem. If it were me, I don't think I would worry about it to much. I know I wouldn't pay those guys over $800 smacks to take it out.
As long as this piece is 6" long, then it is stuck in your tube and is in no danger of getting into your cranshaft area. The distick is in the middle of the engine over the balance shaft. Even if it were to fall in, it'd be in between two bearings of the balance shaft where it should still not cause any damage.
If you have had this ? (unknown as to what it is, boat or PWC) for a while, then you'll know first hand, does it use oil? If not, then this oil change you did will be good till the "off season". Worry about it then. If your dipstick doesn't fit all the way in now because of that tube, you may want to trim that or find a way to plug your tube to keep foreign objects from falling in. But I wouldn't let this bother me. You also have a low oil pressure switch that will take care of your motor in the event there is a problem. The EMS system will take care of any oiling problems it detects and shut it down and throw a code. The only real problem will be not being able to check the oil accurately. But if its a ski/boat you've had for a while, then you know how much oil it uses.
Good luck and if you do decide to pull the engine, we have a manual you can do it with and the help to get it done. You will have to take a lot of it apart where it sits before pulling the block, if it's in a ski anyway..........