My first oil change is coming up. The hyundai manual recommends that you use 5w-20 but says if not available you can use 5w-30 too. I think that 5w-30 is the way to go. 5w-20 is way to thin. Look at the data sheets at the end of these pages and compare them
5w-20
http://www.amsoil.com/storefront/xlm.aspx
5w-30
http://www.amsoil.com/storefront/asl.aspx
The 5w-30 is stated to last 25,000 miles while the 5w-20 is only stated to last about 7500 miles. I think 5w-20 is way to thin to provide protection and is sacrificing engine wear for a 1% increase in mpgs. Particularly important I think for a GDI engine is the Noack Volatility test, the 5w-30 is ~30% better vaporizing a lot less oil. Hyundai gives you the choice in the owners manual and I do not think the minuscule boost in mpgs is worth the engine damage or wear.
What do you guys think?
5w-20
http://www.amsoil.com/storefront/xlm.aspx
5w-30
http://www.amsoil.com/storefront/asl.aspx
The 5w-30 is stated to last 25,000 miles while the 5w-20 is only stated to last about 7500 miles. I think 5w-20 is way to thin to provide protection and is sacrificing engine wear for a 1% increase in mpgs. Particularly important I think for a GDI engine is the Noack Volatility test, the 5w-30 is ~30% better vaporizing a lot less oil. Hyundai gives you the choice in the owners manual and I do not think the minuscule boost in mpgs is worth the engine damage or wear.
What do you guys think?