Best oil 4 91 honda accord 4cylinder 5 speed with 315000 miles on it?

Best oil 4 91 honda accord 4cylinder 5 speed with 315000 miles on it?

I'd use oe 5/30 conventional oil. High mileage type. Not synthetic. Only because this has a fair amount of miles on it and prolly has some blowby as most high mileage engines will.

unless! Of course, if it's had synthetic all it's life. Then i'd get the synthetic high mileage oil and keep using 5/30.