CLS6MT 100k .

hi guys sooo i had a bad misfire one day cylinder just wasnt operating , replaced the coil then it was all good . checked car and fluids and noticed lots of coolant was just gone. car has never been hot in years i never really run it hard . cant see external leak . so i drove it and noticed i needed to add more coolant. no other symtoms asides from engine is as powerful or just isnt running at its full potential . havent checked spark plugs havent done compression test . now the car is holding coolant but power isnt all the way there. hope its not the head gaskets . Valve? im third owner ive had it for 5 years idk how this could happen . anyways car is gorgeous i put alot of money into it . u guys wanna see it ill post pics . oh yeah its whiteteeeeee. any help? ;]

 

Check your oil for 'milkiness' to determine if it's not a bad HG.

 

no milkyness but thats not a for sure test like a hydrocarbon or compression right ?