I will say that Mobil 1 ATF helped the shifting on my marginal 126 tranny. Also I have no leaks that I've noticed either.
What is driving me nuts at this point is my 300TE's oil pressure dropping to zero (yes zero, not the recommended minimum of 0.3) at idle. I am running M1 0W-40 right now, but I will probably switch back to 15W50 at my next oil change.
Lehigh Valley PA USA
73 Olds 88, 72 MB 280SE, 78 Datsun 280Z, 71 T-Bird, 72 Olds 88, 83 Nissan Sentra, 85 Sentra, 73 230.6, 91 Integra, 83 300SD, 91 Volvo 940GLE wagon, 84 300SD, 95 Subaru Legacy L wagon, 02 Mountaineer, 91 300TE, 08 Murano, 2007 R320CDI 4Matic 52K, some Hyundai, 2008 BMW 535xi wagon all gone... currently
2007 Honda Odyssey Touring, 2011 Honda Odyssey Touring