Which motor oil do I (Charles Navarro) use in my aircooled Porsche?
Although there are many excellent motor oils out there, considering the wide array of oils I have access to, I currently am using Brad Penn 20w50 API SJ for the summer and winter months in my aircooled Porsche since it never sees sub-freezing starts. The Brad Penn Penn Grade 1 Racing oil is the same “green” oil everyone was familiar with back when Kendall GT was the best motor oil money can buy, as both the original and this newer product both come from the same facility using genuine Pennsylvania crude. These oils are proven to protect cams, rockers, lifters, and all valve train components as well as provide superior rod bearing life because of their very high HTHS viscosities AND low levels of individual detergents to net a high level of detergency with the use of Ca, Mg, and Na synergistically. Just ask anyone about the “green” Kendall oil from decades past and you’ll know why we like it so much. Likewise for winter service, we run Brad Penn 10w40 API SJ. Another great oil, if not a
