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Why is gasoline not good? Other than it's dangerous, catches fire easier than diesel or kerosine.

What's a)kerosine and b)mineral spirits also known as paint thinner(commercial name) in Chinese?

Not really a motorcycle part, but still related somewhat. Clean your chain! But since the...

OP keeps updating the first post and this will be make the thread a sticky?

Crack open a computer hard drive, its got two strong magnets inside. I'll do this before I change the plug next oil change.

http://www.engineersedge.com/hardware/metric-external-thread-sizes1.htm
Here's a chart with bolt sizes in metric. I suppose you can check if there's enough clearance if you stick your finger in....

How about oil drain plug?
How about magnetic oil drain plug? I'm trying to look for one on Taobao, anyone bought one of those before?