i blew a head gasket in an ea81 once..... not pretty.neat gurgling sounds , but none the less, not pretty.it had over 265,000 on it though.and i must admit the previous couple of months i was not attentive to her needs .in other words , when you hear a sound, check it out.when you see a difference in performance, check it out.
old cars are like women, pay attention to them and they will last forever.
ignore them ,and they will go away quickly...and mad.