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.

)put in 6 full qts with no need to add some and the level has been fine after a short drive to saturate the filter(holds near a .5 qt I believe). For me that puts the level near dead center of the acceptable level. I've never seen smoke of any color so that has me stumped. When you drain the old oil, is the front of your car higher than the rear to allow most of the oil to drain out(if the front of your car is not higher, it's possible you're leaving too much left in the pan). Do you fill/check it on a level surface?