You'll have to explain your reasoning there. At low temps the 0W40, being lower viscosity, will experience less pressure drop. Since the oil thermostat only opens when the oil is hot, both oils will be about 40W and experience about the same pressure drop. Sounds like a wash.JeffYoung said:The extra lines and remote cooler will cause a pressure drop. This may be why Lotus recommends the 5W40 over the 0W40.