You need to remember that motor oils with thick viscosity perform best in the hotter regions, while motor oils with thinner viscosity perform best in the colder regions. If we compare between 0W40 and 5W30 oils, 5W30 oils are thicker than 0W40. Consequently, they perform better in hot temperatures. This is why it should be better to stick to 0W-20 - 44 cSt @ 40C to 8.2 cSt @ 100C. 5W-20 - 48 cSt @ 40C to 8.5 cSt @ 100C. 5W-30 - 55 cSt @ 40C to 9.9 cSt @ 100C. By switching between them, you won't notice anything. You might see a more significant difference between your gasoline purchases than between the different motor oils you're using. From Mobil website, comparing Mobil 1 0W20 and 5W20: SAE Grade 0W-20 5W20 Viscosity @ 100ºC 8.7 8.9 Viscosity @ 40ºC 44.8 49.8 Viscosity Index 173 160 HTHS Viscosity 2.7 2.75 Flash Point 224 230 TBN 8.8 NA MRV @ -40ºc 9200 NA M1 AFE 0W20 is very slightly thinner than 5W20 at operating temperature, but much thinner at start up therefore If not, 5W-30 should be fine and is what I'd run. I guess you could split the difference and go with 0W-30, if desired. Reactions: Revving2Redline, carviewsonic, Nesterenko and 1 The engines getting 0w20 or 0w30 don't give other options since these grades are full synthetic. The days of 'oil grade choices' with hyundaikia are coming to an Difference between 0w20 and 5w30 engine oil: 0w20 engine oil is known as the popular choice of lubricant that delivers the best performance. It flows well even at cold temperatures when compared to the 5W-30 oils, thanks to the ability of the lubricant to maintain the same viscosity or the semi-fluid consistency throughout the internal Nov 7, 2020. #5. The 4.2 V6 in my 07 F150 was built 1997-2008. In all those years of production the tolerances and clearances had NEVER changed. Up until 1999 the spec'd oil was 5W30. In 2000 Ford spec'd 5W20 for CAFE reasons ONLY. In the 159K miles on my engine since new I have used 5W30 about 90% of the time. .

difference between 0w20 and 0w30