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Most likely the oil drips right on the dipstick. A friend (Total idiot )next door blew up his new ford a few years back . Changed the oil himself after putting in three quarts he check the dip stick. It read full he then assumed the oil was full. His car before this an old huyndia that only took 2 quarts. I came home from work that day and he asked me how much oil my truck held. I told him 6 he said he put in three quarts and it read full so he drove it to Riverside and back . It was about 40 miles oneway in heavy L.A. style traffic summer 105 - 115.
Anyway he started the truck and it had a loud knock . We called the dealer and he said "Bring it on in", I offered to call a tow but he tried to drive it there and made it five miles.
Found out from the dealer that a lot of people will pull the dip stick without wiping it down. The dealer check the oil it was bone dry.
So it sounds like the warning sticker is an "idiot- moron" fail-safe implement. I wondered `cause there is no mention of this in the O's manual - and I had never heard of it before - perhaps if this is the reason Ford should have just put "make sure you wipe the stick clean (dry) before re-inserting as well as make sure the vehicle is as level as possible - and wait at least 5 minutes before checking to get as accurate of a reading as possible" - guess they didn't have enough room to put these "common-sense" words on such a small sticker (?) . . . anyway, thanks . . .
The above explanation sounds good, but I think it also may be to equalize the air pressure (so it drains better) I always leave my cap off when I change the oil; it makes me think that I'm draining it better .)
BigMattXXL - man, granted, I do the same thing, like you said, it vents the pressure for better flow (draining) of oil - but if I'm just ADDING oil (?) - I don't know - no big deal, was just curious. I really don't like just lying my dipstick down to ADD a quart - but again, I think you're on to something with the air pressure - probably helps keep back-pressure off the pour spout a bit to keep it from flowing back out all over the valve cover (exhaust manifold, etc.) Happy dipstickin'!
Hmm....point well taken. I think the other guy was right about Ford not wanting people to make a mistake and think their oil level is OK. That's the only explanation I can see....
The owners manual on the 1994 F150 5.0L I used to have said to remove the dipstick while adding oil during an oil change. I believe the reason was that if you didn't remove it, some oil may back up into some vacuum lines.
Interesting, and good to know. I've just never heard of this practice, especially when just "adding" oil. I'll do as the sticker says (when I'm not rushing tooooo much and forget!), just wish they'd have noted it in my O's manual - seems to "sink" or "stick" in MY head better if I've read it in a manual.
>Why does a sticker under the hood of my `99 Ranger say to
>pull or remove the dipstick when changing or adding (motor)
>oil ? Thanks . . .
Actually, while i'm sure the other folks here are most correct that this is mostly an idiot proof mistake when changing your oil...
In the case with my car, the threads of the oil vessle fit perfectly nicely inside my oil intake, and careful placement will allow me to put oil, walk away, and come back and drain the entire jug of oil. Removing the dipstick seems to provide air displacement needed to burp my jug of oil.