If the 1g head is anything like the 2g head, there is an oil passage behind one of the exhaust manifold stud holes. If that particular exhaust manifold stud becomes loose or falls out, you will lose oil quickly. This happened to me (exhaust manifold stud fell out) oil squirted out of the hole.
Mitsubishi is retarded for alot of things that they do. For example 2g motors, 7 bolt, smaller head ports, restricted intake mani, smaller turbo, smaller tb. There automatic transmissions. I could name things off all day long.
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