Its not the oil, increasing temperature will thin out the oil. If it cranks easily but won't start it could be the spark plugs or the spark plug wires. When they heat up, especially if they are old, they won't perform well. Pull off one of the wires and hold it close to the plug, try to crank the engine and look for a spark. If it sparks them try removing a plug and check to see if it looks wet. If its bone dry it might not be getting fuel.
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