[54blackhornet]

I live in a rural area and run 15/40 Dello 400 in all my older vehicles and equipment. My Onan generators that power the property have a combined run time of over 30 thousand hours total. I have never had any engine issues running this oil. My 71 C/20 has run on it since 2003. I do religiously change it every 100 hours in regards to the generators and every 3000 miles for the pickup.