"Can I go back to regular oil after using synthetic?You can't switch back to conventional oil: Once you switch to synthetic, you are not bound to it forever. You can switch back to conventional oil if you choose to do so and your vehicle manufacturer doesn't recommend otherwise.Oct. 21, 2019Should You Switch to Synthetic Oil? | Firestone Complete Auto Care"

"Can I go back to regular oil after using synthetic?You can't switch back to conventional oil: Once you switch to synthetic, you are not bound to it forever. You can switch back to conventional oil if you choose to do so and your vehicle manufacturer doesn't recommend otherwise.Oct. 21, 2019Should You Switch to Synthetic Oil? | Firestone Complete Auto Care"