Originally Posted By: FordCapriDriver
Originally Posted By: DriveHard
5w30 in the winter and 5w-40 in the summer in my truck. My wife's BMW always gets the 5w-40.
5W-40 does not get you into the thick oil club son.
Apparently, it does in North America, particularly if not the original spec. I've been berated here over my choice before.
For my dad, the thick oil club (he disliked thick, and used thin as possible, thick as necessary before it was fashionable) included anything that wasn't a resource conserving grade for a PCMO. If it was diesel, well, diesel engines have their spec, so 15w40 in summer and 10w30 in winter were permissible. But, a 10w30 HDEO was too thick for a gasser and a monograde was sacrilege, or at least obsolete garbage in his view.
I guess growing up in this part of Canada on a farm without electricity before multigrades became available would taint one's viewpoint.