Engine Letter Codes This should help you decipher what sort of engine you have in your Volkswagen. The "Code" column shows the first character or two of the engine code, stamped on the case.
Volkswagen Type 3
Code: Year: Engine:
O 1963-1965 1500 (no cam bearings)
TO 1966-1967 1500
UO 1968-1969 1600 (fuel-injected)
UO 1970 1600 (dual-relief)
U5 1971-1973 1600 (7.7:1 compression)
X 1972 1600 (7.3:1 compression)
