[/qb][/QUOTE]My engine is all new but old style seals and what not. It does not have the design of a 4.6L. Newer engines are designed to not leak with synthetic. It is not a falacy that synthetic oil will make a car leak. Trust me it can make a car leak. It would kill me to see that thing spring a leak. [/QB][/QUOTE]
I do understand that this engine is a 302 Ford Windsor engine, I don't agree with your statement that "synthetic oil will make a car leak", its true that if there is a weak seal synthetic may find its way through more readily than dino. However, there's no reason if proper gasket installation procedures are observed that your engine should leak no matter which oil you go with. This all boils down to type and quality of gasket set, type/types of sealants used (and application there of) and the cleanliness/condition of the gasket surfaces. I did try Royal Purple 40 wt. synth in my 460 jetboat once, not a single leak. If you have a gasket leak its the fault of the engine assembler, not the engine design or oil type. I'd be happy to share my gasket methodology via email if your interested, its off-topic for this forum I think.