what causes blown head gasket
rebuilt engine put in 2 yrs ago, and has regular services thru Toyota dealership for
maintenance such as oil change or tune up; anyhow had oil change done by someone
else and they noticed sludge type goop on radiator cap as well as in overflow
container, and even with water in radiator it suddenly overheaded in seconds... weird,
was told blown headgasket, yet i saw no white smoke and car seemed fine, is 2000
too much for repairing gasket and aweek to complete?