Intermittent Oil Loss

On my 1982 GL1100, I check the oil every tank of gas. Most of the time the oil level is spot on, no loss. But twice now I've lost an entire quart of oil during the tank. Oil is always checked engine cold, bike on centerstand.

I cannot correlate this loss to anything specific in my driving. The first time it had happened was after 700 miles of commuting, I checked the oil, it was fine. I took at 100 mile country drive. Before I turned it toward home (the engine was cold and bike was on the center stand) I checked the oil and holy smokes, I'm a quart low. Must've been something strange in the 100 mile run. Extended run at highway speeds, right?

Well, wrong. It didn't use any oil on the return trip. Even though it was the same distance and same type of ride. Perplexed, I vowed to keep a close eye on the oil level.

I did another 650 mile drive, and drove another 200 miles of commuting traffic, and didn't lose any oil. I checked it after every tank.

Then, this last tank, another one spent in commuting traffic, I lost a quart.

What gives?

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