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I spoke to the RX-8 guy at the dealership where I got my car regarding the type of oil to use. He informed me that after discussing the issue with Castrol Australia, Mazda Australia has decided to use Castrol Magnatec motor oil, 5W-30 grade. He told me it was a combination of a synthetic and a mineral oil.
My local Super Cheap Auto shop only had Castrol Magnatec in 10W-40.
So I'm off to look for some of that oil over the weekend.
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I went in to Cars Plus to get some oil. After reviewing the owners manual with one of the shop assistants...page 8-15, the table 'Except Europe' clearly indicates that 10W-30 covers the temperature range for the majority of climates most of us will be driving in. This oil viscosity covers the temperature range from minus 28C to plus 40C.
North Queenslanders and Northern Territory owners would probably require 10W-40 or 20W-40 (or even 15W-50 or 20W-50) to cover the highest extremes of temperatures during the summer.
5W-30 covers temperatures from minus 33C to plus 42C, so I don't see how it could give the best performance in the Aussie climate.