A few days ago I changed my spark plugs at 98k miles a noticed they all had WHITE all over the tips. I know this is not normal and could lead to some other source? I figured they were the original platnum plugs they were NGK-R's. Could this be why my car seems slower then most 4th gens? Maybe I'm running rich or lean? Pics:

 

By the way, this is off the internet, but mainly it just means the spark plug is getting too hot, which means the engine could be overheating.

EDIT: I wouldn't worry about them becuase I just pulled my sparkplugs out of curiosity :P and I got the same exact thing, and I replaced them less than 50k ago I think it's just normal wear, except my electrode wasnt worn. so dont worry about all the other crap I said lol

 

Those plugs look fine. Electrode is a little worn, perfectly normal.

 

Platinums are rated for 50k

coppers are rated for far less... maybe 20k-30k

 

I pulled some sueperwhite plugs from my i30 back in the day, looked similiar to yours and was like "wtf"...... than I checked the heat-range, dealer put +1 hotter in it

 

Well I put new oem ngk's in and now use premium fuel only, so it should be fine now, I dont think the previous owner ran premium which may have caused them to be a little dirty.