M mazdaspeed32007 Member : Mazdaspeed3 Jul 19, 2008 #1 i have RP 5-30 and am about a half a quart low. i have some M1 hanging around also 5-30....am i cool to mix the two full syntec oils?
i have RP 5-30 and am about a half a quart low. i have some M1 hanging around also 5-30....am i cool to mix the two full syntec oils?
