I think that is all KENNYv runs in everything he has, gas or deisel. The current popular thing seems to be HDEO and synthetic in multiviscosity for 4 cycle OPE on this forum if you want the best or better than average at least. On other forums it can vary but T6 or Mobile 1 is very popular. Just a few years back the big fad seemed to be HDEO in 15w40. I live in a small town, i have talked to many people, only one uses a synthetic oil. Every lawn tech i have talked to uses 30 weight in the summer, will put in 10w30 if you ask for it. They pretty much think oil is oil. Just for giggles I asked 8 people in one day at random what kind of oil was in their lawntractors, all 8 were useing plain oil 30 weight. Another time i asked 6 people, 4 women and 2 men what oil they used in their push mower. The two men had no idea other than the oil that came with it. Two of the women said the mower had oil in it already, they saw the man from the store put the oil in. One woman said she did not know, she added from some old bottles that were in the shed when her husband left her for a younger woman. One woman proudly announced she used STP 10w30 from Dollar General and changed it every single year. The one fellow I know who used 10w30 Mobile 1 said he changed it every three years. When I asked him if He thought this oil had enough zddp in it he replied Mobile 1 had no such thing and did not need it whatever it was. One other fellow told me his lawnmower deck was so slick because he used Penzoil with moly, said it blew out the muffler and penetrated the paint. My 89 year old neighbor has told me 30 times that Mobile 30 weight was the best oil made since he began to use it this year on his old rider. Poor guy is so blind he cannot see that the oil he bought is 0w30, not 30. I think you are ahead of the general population, no worries.