The bill for the four-year service on a Porsche Carrera GT comes in at about $8,000. What do you get for the money? The 4 year service schedule includes: Diagnosis system: Read out fault memory Change engine oil and oil filter Change manual transmission oil and oil filter Replace drive belt Check valve clearance Replace coolant regulator Power-assisted steering: Check fluid level Underside of vehicle and engine compartment: Visual inspection for leaks (oils and fluids) and