My MG sat for 18 years. Turned the engine with a wrench to ensure it wasn't seized first. Gave a squirt of oil down each spark plug hole, gave it an oil change, and started cranking with a new battery. Oil pressure came up, but it turned out the electronic ignition had given up the ghost. Installed a new Pertronix module in the distributor, and it started right up, even on 18 year old gas.