I looked everywhere in Anchorage AK today and could not find any GC 0W30. The only thing I saw was SYN 5w30. I know it's no the same but is it close to the GC. I hvae a new Maxima 3.5 and I heard these things are hard on the oil. I have done alot of reading here about the. Would the SYN be as comparable as the gc0w30. Thanks in advance.