Ok, so I've read enough to make my eyes pop out. My engine is internally the same as previous 5.0's, it just has a larger capacity 8-8.5 quarts and a heavy duty oil cooler. Ford recoomends 5w-50 Motorcraft synthetic. I also read that they recommend this because they assume the car will see track time. Other folks seem to think the cam phasers are affected by the oil weight and that they were tuned from Ford using 5/50. I tend to think it's recommended just for protection while running extended high rpms at the track generating much higher internal temps and loads.
With that said, I've read something consistently about Motorcraft 5/50 synthetic that I don't like. It shears off within 1000-1500 miles to bascially a 40 weight. Would I be better off running a 10/40 Penzoil synthetic, a 0/40 Mobil1 euro syn, Amsoil 10/40 AMO, Amsoil 5/50, or something else? Mine has seen one track event this year, possibly one more. I daily drive it and have 13k miles on it. I don't beat on the car (I'm 43 and pretty sane), but I ran it hard at the track and will probably make some dragstrip passes this fall. Thanks for any input, first post here, trying to not go as nuclear as all the reading makes one feel.
With that said, I've read something consistently about Motorcraft 5/50 synthetic that I don't like. It shears off within 1000-1500 miles to bascially a 40 weight. Would I be better off running a 10/40 Penzoil synthetic, a 0/40 Mobil1 euro syn, Amsoil 10/40 AMO, Amsoil 5/50, or something else? Mine has seen one track event this year, possibly one more. I daily drive it and have 13k miles on it. I don't beat on the car (I'm 43 and pretty sane), but I ran it hard at the track and will probably make some dragstrip passes this fall. Thanks for any input, first post here, trying to not go as nuclear as all the reading makes one feel.