A weekend of oil changes...
2001 Nissan Maxima SE, 308,000 miles
Valvoline MaxLife Full Synth 5w30
PureOne filter
6-8,000 OCI
2001 VW GTI, 1.8t, 83,000 miles
Castrol Syntec 5w40
Bosch filter
6-8,000 OCI
1997 VW Jetta, 2.0, 163,000 miles
Castrol Syntec Blend 5w30
Fram ToughGuard filter (Advance Auto Parts combo sale)
Theoretical 8,000 OCI (It's my kid's car. You know how that goes)