Considering it came fully setup I would be claiming warranty replacement. But here we never receive engines with oil from the factory except some left oil from assembly.If Briggs is now sending out engine this way it is something new they are trying.
I just installed two Briggs' last month and neither had oil supplied. They came straight from the Briggs warehouse.
I would be curious as to why the engine failed though but you shouldn't be going inside unless you are an authorized warranty repair centre. Briggs would use that as an excuse not to honour the warranty.
