Thinner oil mostly has more synthetic oil mixed in.
It works well with modern small engines. Eco cars.
Like a Chevy spark (1.25-1.4 liter), Chevy sonic/cruze (1.4 liter turbo/1.8l NA), Nissan Versa (1.6-1.8liter), Ford Fiesta (1.5-1.6 liter), Dodge Dart (1.4l twin turbo), etc...
The engines are not generating high heat, and are cooled additionally well by the watercooling. Back in the days engines like these ran aircooled (up to 1.8 liter); and thicker (higher heat resistant) oil was required.
But not anymore.
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