Need 5W-20 or 0W-20? AMSOIL is the one Choice
Yes - the twenty weights as I call them are really stepping up in demand. Because of the nature of the close tolerances in engine parts, they are also less forgiving when you lose a typical amount of viscosity. Combine that thought with the fact that engines have to take more abuse. They run hotter and are made to be more compact with less cooling. The demand obviously will only increase and as you have read the 5W-16 weights are on the way. So - that said, I tell potential customers AMSOIL is the only choice here. As we have seen over the decades the run of the mill oils and synthetics sheer out often before the end of their useful life. AMSOIL is the consistent one and as the Sequence IIIG testing shows it's all about protection. If you need a 5W-20 or 0W-20 you need consistency. Only AMSOIL is guaranteed to stay within spec for the advertised interval. We are seeing a couple of the Ford Ecoboost motors remain on 5W-20 while the truck models with this option all use 5W-30. I think this is because the account of more loading but some of the car versions still recommend 5W-20. One more note, just like 0W-30 is the upgrade from 5W-30 and 10W-30, treat 0W-20 as the upgrade from 5W-20. This is for all climates and will offer better performance. That's from the horses mouth!! Technically having a 0W-20, there really is no need for a 5W-20. Everything is met with this viscosity. There is no adverse issues.
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