Today, Porsche released a video starring 5 great aircooled cars from the Porsche museum. When showing the 908/03 Spyder, I noticed that it had a label on the oil tank cap that said 10W60. Incidentally, this is the oil viscosity that Porsche currently recommends for the late aircooled road cars. Any thoughts on this?
The video (minute 4:51):
https://www.youtube.com/watch?v=0UHUKh_oOWI