OM calls for 90 or 80W-90 hypoid gear oil, GL-4 or GL-5. I just replaced it with Mobil 1 75W-90 synthetic. Please tell me the M1 will be ok in this service. Thanks.
I used Castrol syntec 75w90 for our RDX. Fluid stinks but I don't think it ever needs to be replaced. By you replacing it you are ahead of what Honda thinks is necessary.