I have a 2009 5.4 with the 6sp. I had a transmission service performed by the dealer and he shows mercon LV as the fluid put back in. The little dipstick on the bottom of the transmission says mercon SP. what is the difference and is LV ok to be mixed with the original? I assume he dropped the pan and just refilled what came out the way as the invoice shows 5 liters of LV. Any info appreciated.