Any suggestions? I tried soaking in liqiud wrench overnight.

You will need a small 3/8 impact gun and a tight fitting to the drain plug screwdriver socket. Square up to the drain plug with the impact gun and give it small bursts, let the drain plug feel the impacts and I believe it will release. The snap on man sells the correct socket. Buy a drain plug and bring it to the snap on truck for an exact fit.
Good luck
Ed

Use an impact driver, the type that you hit with a hammer. Also try pb blaster its the best penetrant there is.

Don't know that I've ever seen this type of driver- whats it looklike and where would I get one?

I've had success putting a small punch (nail set) on one side of the screw slot and tap it with a hammer.

Shane, I have access to a impact screwdriver if you want to borrow it. Todd

Whenever I had a problem with this I quickly hit it with the torch for about 10 seconds. It always works.

When You Get It Out I Make A Drain Plug With A Hex On It,and A Magnet 3 Times Stronger. Ron Bender 216-390-1330

Sears is probably the best place to get an impact driver look on craftsman.com and do a search for item #47641 and you can see a pic.