Replacing Sparkplugs

Today I was trying to replace the sparkplugs but I can't get any passenger side plugs out. I have heard you can apply penetrating oil or silicone spray... do you know if this actually works. And would any automotive store carry either of these? Thanks

Yeah. WD40, PB Blaster, or something like a really light 3-in-1 oil should work. Just spray it on and let it sit overnight and they should come out.

Prevent it in the future by buying some high-temp anti-seize compound (usually found in the adhesive/silicone aisle at the parts store) and putting a very light coat on the threads before putting the new ones in. Its basically grease that won't melt or degrade over time, so 60k miles later, they'll screw out just as easily as they went in.

Sometimes torqing a bolt forward a little helps break the corrosion so you can get it out, but not to much don't wanna strip you threads.

If it doesnt need locktite to prevent inadvertant loosening , than it must need ANTISEEZE! On the same note: most mechanical problems can be related to:
"This damn thing hasnt seen a drop of oil or grease in many years"

Just a thought. Oil is good. Letting it sit overnight is good. Some plugs have a seal and some have a beveled seat to seal the plug. In either case, the plug is not supposed to be overtorqued (tightened tighter than the spec'd call out for that plug) when installed but this could be the case. Trying to turn the plug in more to break it loose might not be a good idea if it had aready been overtorqued originally. So if you try turning it in, be very careful. Using a breaker bar and maybe even a cheater bar (a sturdy, long piece of pipe fit over the breaker bar) would be obvious to a mechanic or someone whose been around older vehicles or rusted nuts and bolts. But since you had to ask about the Wd-40 or 3 in 1 oil, I'm going to guess that maybe you are kindof new to this stuff. Not to be hurtful or anything.

If it doesnt need locktite to prevent inadvertant loosening , than it must need ANTISEEZE! On the same note: most mechanical problems can be related to:
"This damn thing hasnt seen a drop of oil or grease in many years"
To clarify what I meant by this is when installing new plugs or bolts, it is a good thing to use a smudge of anitseeze then turning the bolt or plug in thus preventing as much dissimilar metal corrosion and to keep a a small amount of lube available for loosening later on. This is why the product is recomended by aircraft airframe and engine mfgrs.
...The bald guy with the Spekled Mutt :rolleyes:

Try "KROIL" .... it will seep into the smallest of openings