Lyc O-320 E2D, S/N L-34839-27A. Performed 100 hour inspection on engine. Compression 1 thru 4 are 68, 70, 66, 66. 80 base press. Changed oil & oil filter, 7 qts Aeroshell 100 Plus, AA48111-1. All spark plugs insp. & service. Inspected exhaust system. All work performed I.A.W. Cessna 172 100 hour inspection checklist, C-172 Maint Man/I.P.C., Lyc. direct drive Serv. Man/I.P.C. I certify that this engine has been inspected in accordance with 100 hour inspection & was determined to be in airworthy condition @ this time, R.T.S.