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When to change your your oil and filter is a highly debated topic.
From my FR-S Owner's and Maintenance manuals:
Normal driving: Change oil and filter every 7,500 miles or seven and a half months, whichever comes first.
Severe driving: Change oil and filter every every 3,750 or 3 ¾ months, whichever comes first.
If one or more of the severe operating conditions outlined below better describes how you typically operate your vehicle, you will need to perform some maintenance services more often, follow the severe recommendations.
> Repeated short distance driving.
> Driving on rough and/or muddy roads.
> Driving in high humidity areas or in mountainous areas.
> Driving in dusty conditions.
> Driving in extremely cold weather.
> Driving in areas where road salts or other corrosive materials are used.
> Living in coastal areas.
NOTE: You should perform these additional maintenance services if you drive primarily under any of the severe operating conditions indicated. If you drive only occasionally under these conditions, it is not necessary to perform the additional services.
Oil grade 0w-20: (I'm assuming they are referring to conventional oil not synthetic)
ILSAC GF-4
ILSAC GF-4 is similar to the API SM service category, but it requires an additional sequence VIB Fuel Economy Test (ASTM D6837).
ILSAC GF-5
Introduced in October 2010 for 2011 and older vehicles, designed to provide improved high temperature deposit protection for pistons and turbochargers, more stringent sludge control, improved fuel economy, enhanced emission control system compatibility, seal compatibility, and protection of engines operating on ethanol-containing fuels up to E85.
API classification SM or SN with the words “ENERGY CONSERVING” or “RESOURCE CONSERVING”
With a synthetic oil, IMO, you can extend the Normal driving change intervals to at least 10,000 miles.
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