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I just go to amsoil.com since with their reduced prices, and shipping, it equals to what they sell it at superautobacs in stanton. Great oil though. I change once a year with oil filters changed every 6 months. No complaints. My Z loves it.
How is your oil level throughout the year? Have you done an oil analysis to see if you are getting normal wear?
But based on VQ oil analyses posted on this forum, it seems that Amsoil provides the best lubrication and performance for the engine. But in terms of value, Pennzoil Platinum, German Castrol, and Mobil 1 are great!