Was talking to my service manager yesterday. He said that the MOCO had issued in writing NOT TO USE 75W(or heavier) synthetic gear oil in the transmission of the new 6 speed transmissions. He said they recommend Syn3 or Formula Plus. He had no explaination as to why, but he said if you had a transmission failure and the MoCO requested the dealer to send in the defective tranny and they tested the fluid and you were running heavy weight gear oil then the MOCO might not repair it under warranty.
Has anyone else heard of this?
ace:
IMO your service manager is feeding you BS! My connection searched all bulletins, letters, etc. for this year and half of last year, and found nothing.
Ask your SM for a copy of the letter, or at least the date it was issued...........

BTW: Switching from Formula + to Bel-Ray 85-140 Hypoid Gear Saver made a significant improvement in the 5th. gear noise/whine and overall smoothness. Was installed by dealer (I furnished) during service, and SM also gave his approval.
