I use the 10W30 in my 72' Chevelle and my wife's 87' Camaro. Neither car sees very many miles, so I use dino. All of my lawn and garden 4 cycle engines get Penzoil HD30. This includes 1 Kohler, 1 Wisconsin and 5 Briggs. All we've EVER used, always worked great. No failures, no sludge, no consumption issues.