I would say no. It sounds like water is entering the combustion chamber from maybe a bad head gasket.
Mixing synthetic with semi-cynthetic or even conventional will cause no harm at all. Mixing weight will give you another weight based on the mix. If you mixed 2 quarts of 5w30 with 2 quarts of 10w40 you will theoretically have a weight of 7.5w35.
Open hood, look to right side of engine, black cap just behind serpentine belt. Very easy to reach. But before adding fluid be sure you get correct fluid. A lot of these cars take a special synthetic, mixing regular and synthetic will cause harm to system
Dermatitis? Engine oils are for engines not your skin.
No. A bad head gasket would cause water to come out the tailpipe. You will see white smoke. Leaky rings would cause oil to come out the tailpipe. You will see blue smoke.
Well, the best oil is either Mobile 1 or Castrol FULL SYNTHETIC OIL... 5W-30 or if you have higher miles 10W-40... PLEASE MAKE SURE YOU USE SYNTHETIC, this is what VW/Audi uses from factory on all their engines... Contrary to what many people say... YOU CAN NOT use regular oil on a car that has had Synthetic oil... it is almost like mixing water into oil... due to the synthetic oil creates a barrier in you engine to help protect it longer... if you put regular oil in an engine running Synthetic, this will cause EXTREME Engine Sludge Buildup... causing the engine to not operate correclty and costly repairs to the engine...
MaybeMaybe
Yes
Mixing two kinds of oil will in most cases not cause any problems, but if i where you, id take out the old oil and put in the new.
It could, depending on the cause of the misfire.
Head gasket or cracked head
no but it may cause it to stall if exhaust is blocked
black is excess fuel