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Originally Posted by AlanS
why would 5W50 be detrimental? It seems it would have similar cold-temperature viscosity for starting but would provide better protection at high temperatures.
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No, it would be thicker (more viscus) than it should be when the engine is warmed up - 50W instead of 40W. The oil wouldn't be flowing as well as it should be. At least in Lotus' opinion, but what do they know...