I love my W140!

As of lately the old gal has started to lose power over time. Today is worse than usual... push the pedal while cruising 60 MPH on the highway and it doesnt go any faster. She is in need of some attention. I am just curious where to start. I have had the car for 15k miles and done just oil changes.

She has 190k miles on the clock

any help would be greatly appreciated!


-Will