John,
my experience with QS oil and others is similar, same sludge , same conclusion, won't use it even today.
The "scientific" explanation- accurate back in the day- is that PA oil is heavy in higher molecular weight fractions or what we would call "waxes". Hence the tendency to form sludge.
Of course this is back in the day before the many additives to motor oil and refinements to the "detergent" properties. The old oils had no "detergent" added.
But in all fairness to QS, 4-5K was way to long to wait to change oil back in the '70s! So you did contribute to the problem.
Any way- back to lugers- just to stay on topic.
I would not soak my "anything" in a mix of gas/mystery oil- sounds like a recipe for disaster! And very messy. JMHO.
