Did this after my last free OCI at the dealership. They are a Mitsubishi dealer but use Castrol Full synthetic for all of their synthetic oil changes (0w20)
I normally try to do the 3.5k OCI with basic oils, I did since new 500 mile OCI w/m1 eco +napa gold, 3400 OCI dealer with wix filter and this recent oci 3300 w/mitsubishi filters both times that I replaced with a wix when I got home (also had to drain almost a quart because they are idiots and always put 4 qts in my car)
This time I have redline 0w20/M1-110 going for 7K miles then testing it.
I normally try to do the 3.5k OCI with basic oils, I did since new 500 mile OCI w/m1 eco +napa gold, 3400 OCI dealer with wix filter and this recent oci 3300 w/mitsubishi filters both times that I replaced with a wix when I got home (also had to drain almost a quart because they are idiots and always put 4 qts in my car)
This time I have redline 0w20/M1-110 going for 7K miles then testing it.