So I have been working on this bike for roughly a year. I have a vast knowledge in automobiles but this two-stroke engine really baffled when I didn't know what kind of oil, or different types of oil this bike took. I was thinking two stroke oil for burning, engine oil for lubricating, and transmission oil. As I thought about it there was no way this bike could have three separate types of oil, I was right. So I did some extensive research. In a traditional automobile you have oil that the lubricates the internal dynamic parts in the engine. The oil is stored and sits at the bottom of the engine in a oil pan aka sump, this is a wet-sump application. The 1972 DS7 has oil injection from an external reservoir that is pumped into the head where is mixed with air and fuel in the crank case and then combusted in the combustion chamber, before the ignition occurs the complete mixture travels throughout the crankcase first lubricating the bearings, crankshaft, rods, and pistons, this is a dry-sump application. Here is the description that helped explain it a little more:
Two-cycle motors are considered total-loss type lubricating systems. Because the crankcase is part of the intake process, it cannot act as an oil sump as is found on four-cycle engines. Lubricating traditional two-cycle engines is done by mixing the oil with the fuel. The oil is burned upon combustion of the air/fuel mixture. Direct Injection engines are different because the fuel is directly injected into the combustion chamber while the oil is injected directly into the crankcase. This process is efficient because the fuel is injected after the exhaust port closes, and therefore more complete combustion of fuel occurs and more power is developed.
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