[H. L. Chauvin]

I think Mr. Rogers's diagnosis is exactly correct with his reply #8.

I had an early 1970's car that developed a connecting rod knock. Drove into a large inner-city engine rebuild shop ..... owner/mechanic immediately told me, (without asking), that I was using Quaker State oil made with Pennsylvania Crude.

Told him the former owner recommended it so I did use it. Owner/mechanic then showed me about 20 removed oil pans on display in his lobby full of thick crud from customers who had formerly always used Quaker State oil.

Then he showed about 20 "immaculate" oil pans from customers using his recommended Castrol GTX oil.

When he removed my oil pan, the bottom of the oil pan looked like a group of experimental chickens on a Milk of Magnesia diet had been roosting on my crankshaft for (5) years .............. without diapers.

Have no idea if Quaker State later changed their oil formula because with this one poultry droppings experience I did not buy any oil from them in about 40 years.