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Thanks. I'm in San Diego so there are no hot summer months or cold winter ones. For the last 20 years we have had Hondas and have changed to oil once a year, which is far less that 7500 miles. I can buy the Mazda GF-5 w/moly oil for less than Mobile1 (which my Costco doesn't have in 0W20). My...

Mazda says 7500 miles or six months whichever comes first. That seems overly aggressive (and expensive and unfriendly to the environment) for someone like me that drives about 2000 miles in six months. I called Mazda for an explanation, since almost every other manufacturer says 7500 miles or...