I just saw the famed GC at AZ last night and I know much has been posted on it, but it would take hours of searching to answer my questions so here goes... At $4.99/ quart is it a buy as compared to the $3.98 Syntec on sale at Advance Auto? Would it be O.K. for 2001 Civic(5w20 rated) and/or 1999 Caravan ? Would it blend nicely with dino Castrol to make a blend? Is it still being produced? Thanks all! Merry CHRISTMAS!