Debunking the Myths 5W30 vs. 5W40 - A Critical Examination of Motor Oil Viscosity

5w30 has a lower viscosity of 5 and higher viscosity of 40. ... It is thicker is cold temperate and stays thicker engine heat. It is thicker in ... 5W-30, 5W-30 SP AK145(4L), TURBO-R 5W-40. AK125(4L), 2.7, 2.9. 660, HN22S, K6A(DOHC,VVT), 01/4～09/10, 5W-30, 5W-30 SP AK145(4L), R-Pro -5W-30. AK071(20L), 2.7 ... Like 5W30, 5W40 is an oil with multiple grades. Because of the '5W', it has the same 'winter' viscosity. The '40', however, suggests that this ... 5W30 and 5W40 are multi-grade oils; 5W30 has a lower viscosity at high temperatures, making it thinner under heat, while 5W40 maintains a ... 5w40 oil outperforms 5w30 oils at higher temperatures, being effective up to ambient temperatures of 50°C, as opposed to 30°C. 5w-30 is thinner / less viscous / flows more at colder temperatures than 10w-30 oil. ... Do high mileage oils make a difference? Reduced oil ... 5W40 is thicker at higher temperatures and remains more stable than 5W30 in hot weather conditions. While both oil types resist breakdown in ... 5w40 offers thicker, high-temperature protection for hot areas, while 5w30 flows better for colder climates and improves fuel mileage. For high mileage engines, ... Buy car engine oil from Castrol, Mobil and Petronas, with 5w30 oil and 10w40 oil in stock ... vs Metric Tools · Pressure Washer Buying Guide · Wrench or Spanner? For modern cars, just follow the owner's manual recommendation and you will be good even if you run 15-20min track and let the car rest.