My son just bought a 72 Ford Ranger xlt, nice old truck with the 360ci engine and a c6 automatic. It has 126,ooo miles but hasn't been driven much since 2000 when the owner passed away. His son decided to sell it and my son bought it. What type of oil do you guys think should be ran in it? He's thinking of one of the high mileage 10w30 oils. Thoughts and opinions are appreciated. The transmission and diff will also be serviced. Thanks