Can I switch to synthetic oil on a vehicle that has had conventional it's entire life?

It's a 1990 Cherokee w/130,000 miles. Seafoam and Restore used occasionally if it matters.Can I switch to synthetic oil on a vehicle that has had conventional it's entire life?
of course you can as a cars miles get higher its engine needs better lubrication. ond your oil stays cleaner longer.Can I switch to synthetic oil on a vehicle that has had conventional it's entire life?
as i understand it yes you can, but it will just be more expensive and wont help your engine. just stick with conventional oil, you already have gunk build up that synthetic is supposed to not create.
yes
Sure you can. There's no rules against it. And I recommend it!
yes u can change to sythetic oil but change the oil filter as well