A mosquitoes truck. ha-ha!!
That's too much oil. 2.5 quarts will get you to the full line on the dip stick. It sounds like you have about 3.5 quarts of oil in the motor. That'll make it smoke. Also try 10w-30 or 10w-40 oil. Also the straight 30wt or 40wt works good too. You don't want too thick of an oil.
Here's part of a VW owners manual.
Check your timing too. That might be off and making it difficult to start.