Originally Posted By: HTSS_TR
Australia has fairly narrow temperature range in the whole country/continent so car manufacture may recommend a specific oil grade for the drivers there.
America has very wide temperature range, above 110F in some place for 3-4 months in summer and other area can be as low as minus 20-30 in winter, but the car and engine speed is fairly low so after all the summer/winter test results they came up with the oil grade for U.S.
Originally Posted By: Shannow
Really ?
http://www.heraldsun.com.au/news/victori...3f75-1469006696
Quote:
Australia is the ideal testing ground for the world.
Our government is stable, and our continent can offer everything from alpine snow to baking deserts and tropical heat and rain, with roads from the smoothest freeways to the dustiest outback tracks to test the mettle of new models before they’re sold to the public.
Hottest 123.3F
Coldest -10F
As to the dustiest outback roads, you can drive 100s of miles on dirt, often corrugated, as Ford found when they brought the falcon to Oz in the 60s and the shock towers caved in.
edit...this OCI, both my cars have started at 18F, and 93F
Most Australians live in milder climate, not many live in extreme cold ?
There are millions American live in northern states such as Minnesota, Wyoming, North Dakota ... and there are millions live in desert southwest such as Nevada, Arizona ...
As I said, car manufactures tested their vehicles where they sell their vehicles.
Each location may requires specific oil grade because of the unique weather and driving condition.
Oil recommended for America may not be suitable for Canada, and may not be the same grade as in Middle East or Australia.
It is not correct to say the same vehicle with the same engine is using xWyy oil in Australia or Middle East or Germany then that same vehicle should use same oil grade in America.
Basically, the oil grade recommended in the owner manual is thoroughly tested for the vehicle where it is operated.