Hi guys, I changed the oil in my stang the other day. It says to add 6 quarts, so I drained the pan and started adding royal purple. I added 5 quarts and then checked the levels. I would get very inaccurate readings. Sometimes I put the dipstick in and pulled it out and No Oil at all. Then other times I got a higher than fill limit reading. I ended up adding about 5 1/4 quarts and it looks like theres a little too much in there. When I do get a reading its a bit over max fill. I drove the car around the block and didnt notice anything until I pulled into my garage and gave it a rev. It kicked out a little bit of black smoke when I would rev it up. It never did this before I performed this oil change. I know this sounds ridiculous. Has anyone else experienced a problem with reading the fill level accuratly? Any ideas? Looks like I might have to pull the plug and make a mess.