Service history is OK for the major ones (e.g. fuel filter at 150,000 and the major at 90,000). Not so some of the minor ones. I generally changed the oil every 15,000 in the Elantra with Penrite full synthetic and never had any engine or sludge issues - along with almost all its original compression. I might nudge that down to 10,000 with the Aurion given its tendency to sludge.