It is mainly and oil and filter change, with lots of visual inspection at $120/hour labor rate. E being the 5th the letter of the alphabet, it indicates that about 5 hours will be required to perform the service. Hope this helps.
C-Service includes the following work: Change oil and filter, correct all fluid levels, Check condition of brake pads and discs, check entire exhaust system for problems, correct air pressure in all five tires, check for any fluid leaks, Lubricate chassis on antique cars (newer cars do not require lubrication), Check condition of belts and tighten as necessary, check all exterior lights and replace any burned bulbs, check and replace fuses as necessary, check condition of windshield wiper, stamp service book and install new service sticker in windshield.
E-Service includes the C-Service plus the following additional work: Replace spark plugs, replace air filter(s), check steering components for wear and damage, adjust parking brake, adjust valves if applicable, check and adjust ignition timing on pre 1985 vehicles, check and adjust air/fuel mixture on pre 1993 vehicles, remove wheels and rotate if necessary, replace any burned interior bulbs, clean, lubricate, and adjust all throttle linkages, clean and aim windshield washer nozzles, clean out fuse box, lubricate sunroof guides, lubricate door hinges and latches, check function of climate control system, read all computer fault codes and clear memory of old codes, steam clean engine compartment.