I have a 1994 Mazda B4000 4.0L OHV V6 with 237K miles on it. I’ve been using Valvoline 20W-50 Synthetic Blend. I’m considering moving to Conventional 20W-50. Should I stick to the Synthetic blend or move to Conventional? Will the Conventional oil not protect my engine enough?
stick to what you've been using, switching often messes with engines, see that a lot.