Finishing up baselining my fluids...unless I'm totally missing something, this is a sealed transmission (?), no dipstick/fill tube. In all the threads on MUD about draining/refilling, pulling the pan, flushing (or not flushing), etc., there seems to be little mention of this "feature". Is this common in past years of LC/Lexus? Feel Like I should get at it, I'm at 156,000 & can't assume PO has done anything.