I change my drivetrain oil myself (Amsoil) but for whatever reason, I have the dealer service the engine, . . . . until recently.
I have over 200k without any leaks, anywhere. For the last two oil changes, I started to lose almost two quarts in between my 5K intervals. I don't know if the dealer switched oil's but was told they use CJ-4 for everything.
So I made the switch to Amsoil AME 15w40. I have almost 5K on the AME and I haven't lost any oil yet. I'm guesing the dealer quit using CI-4 and soley uses CJ-4 for everything.