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Yeah, anyone who makes claims like that (neighbor) is so full of it.
Oil viscosity is based on temperature, so the only extreme the engine would see would be way below freezing or "racing." Most synthetics in the normal viscosity ranges are more than enough to protect in street driving, esp CA.
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02 Boxster (DD sans kids)
03 Dodge Ram Quad Cab (Stuff hauler)
06 Maserati Coupe Cambiocorsa (Personal weekend car)
06 Maserati Quattroporte (Family hauler)
08 Corvette Z06 (Track car)
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