Can you switch from regular oil to synthetic?

I did back in 2001 , and have used 100 % synthetic oil in my 1995 Ford

Explorer ever since . As long as your engine is healthy ( doesn't leak or burn

any oil ) I had about 51,000 miles on my engine when I did so I knew the

piston rings had " worn in " As long as you use the same weight of engine

oil that the manufacturer recommends and it meets the manufacturers

specifications ( P.S. I'm not a mechanic / technician )