I have a coolant line to replace near the radiator, and I need to also replace my water pump. So I went out to first drain the block. I started to remove the drain plug on the passenger side, but it's stuck. I applied a good/fair amount of force, but the plug is definitely stuck. Before I go and apply real force (like using a cheater or something), is there something else I should do? I don't want to rip out the side of the block using too much force. Should I use some sort of penetrating oil first? If so, how does the oil get deep into the threads of the plug? And, do you have any recommendations for brand/type of oil?

Thanks,
Thomas

...