Hi all,
My turbo Subaru consumed about a quart of M1 10w-30 over 5k, and the same amount of GC 0w-30 by 6.3k. That led me to put in some Syntec 5w-50 this past weekend (the specs look good-- it's a group III/PAO mix, API SM/SL, ACEA A3, ILSAC GF-4).
Anyone have any opinions on Castrol Syntec...