Hello there. I was hopping for some help in clearing up what type of oil to use, delo 100 40w or rotella t1. I changed the oil my self last season using the rotella and now I wanted my mechanic to do it but he said that delo 100 was the only oil that should be used in these engines is that correct? Also does anyone now how to stop the small oil leak that is coming from the side oil pan plugs. it as simple as just torqueing them down a bit or something else. Any help would be appreciated.