Can You Switch To Synthetic Oil In An Older Harley-Davidson Motorcycle?
A reader asks: I bought a used 1998 Heritage Softail Classic with 47,000 miles. As far as I know, only mineral oil was used in this bike. I’ve heard good things about using AMSOIL Synthetic 20W-50. Is there any problem with switching to synthetic oil in an older engine? Will it leak or use oil?…



