2005 Buick 3.1L Century with 84K miles which until last OC had used Vlavoline Conventional every 3K ~ 4K miles of in city driving . This Oil change I used M1 0W 30 AFE and after 2000 miles the oil color has become noticeably much darker . With Valvoline Conventional the oil color worse case went from clear to honey colored . Does M1 0W 30 have a stronger add pack for cleaning than Valvoline Conventional or do synthetic oils clean better in general ? Also , should I change this first use of M1 0W 30 out sooner than the 6K ~ 7K I thought I would run as an OCI originally ? Hopefully with repeat use of the M1 0W 30 I'll see the oil darken up less with such low miles on the oil change.