I have a 08 Ford Focus with 7100 miles. I would like to change to Amsoil. Max oil changes would be 7500 miles while in warrenty. I am trying to decide between 0W-20 100% Synthetic and 5W-20 Xl. Are they API certified? Also is the 5W-20XL a blend? Any advantages one over the other?
This is my first post and I have a few questions that you guys can help me with. I am the process of having a new 5.7 Vortec Marine 320 hp carb version installed in my boat. Bolted to a Cobra outdrive. A engine oil cooler has been installed as well.
1. The shop that is doing the install states...