what weight oil to use for a 302 foxbody

[lx5091]

I've always run Mobil1 in everything I have. This has never caused any problems for me. I currently have 105K on the odometer. I change it at around 6000 miles, because it always has a lot of surfactant to it still and this is when it tends to start getting dirty. You want to change your oil when it gets dirty, because all oils are good enough these days to go 20K and still be slick, the problem is the detergents suck up the dirt in your engine and once they have captured as much dirt as they can then the dirt that cannot be "captured" by the detergents will float around in the engine and start to cause damage. When your oil gets dark it's time to change it, and I find that I can usually go 6K between changes using Mobil1.