I am the newest owner of a '67 Chev C10 Truck with inline 6 and want to change the oil. I understand that full synthetic is not necessarily a good idea due to its tendency to leak in older engines such as the 250. That being the case, what is the best oil and best weight recommended. Hybrid? Straight non-hybrid? Mobil, Castrol or ?

Thanks,

Last edited by Smitty550; 05/29/2017 3:13 AM. Reason: left out a phrase