I have an Idea, and I want to know if this might/will have any negative consequences for my WRX engine.
I run Mobil One in my WRX. Switched at 18k. I do my own oil changes, yet I have this one random slip for a free oil change at a subaru dealership. I was thinking about using it, driving directly back to my house (1 mile, literally), and then draining the conventional and doing another oil change with Mobil 1. The idea being to flush the oil system of my rex. I would also use a new filter (duh).
Good Idea?/ Bad Idea?/ DIAF?