I pick up my new generator tomorrow to replace the 15 year old one that fried during our last ice storm. The manual online said to install the provided 30w oil and change after 30 hours. After that it shows a temperature chart for what oils to use. They also say that 5w30 synthetic can be used in all temperatures. My questions are, what would you use after break in and would you use 30w SN rated Chevron Supreme for the normal service intervals after break in? I have a bunch and it’s cheap. I can also get Napa 5w30 for 3.19 a quart so the cost isn’t really a big deal. Just thinking that a straight weight is better in this situation.