I take no credit for this, but thought it worth sharing. Posted by Sean over at 914World. Some of the tech items apply specifically to 914s, but you get the idea.
each car has a song that it sings. there is a pitch, a tone, a level. you know it if you listen. if this "song" changes, something has happened. INVESTIGATE.
your car has a feel, a grove. you learn how it pulls thru the gears. you know how much gas pedal it takes to cruise. if it changes, INVESTIGATE!
often times it is something simple or cheap to fix. if left unchecked it can turn into disaster.
STOP!!! DONT KEEP DRIVING, PLEASE. its not going to fix its self. cars do not heal as human flesh can.
if your car starts to lose power, STOP. it's telling you something
260 deg oil is bad
400 deg heads are bad
I hate seeing these cars come into my shop.
stop. your car is screaming "daddy, please dont hurt me, I'm sick. help me daddy, help"
dont try to make it to the next exit, stop.
This was posted after a someone left some paper towels wedged behind the battery in the engine bay. That towel worked loose and got caught in the fan shroud and managed to clog up the cooling fins on the cylinders.