At 05:04 PM 6/19/2010, Don Hanson wrote:
>in some of my higher mileage engines, based on that characteristic it had to
>be *really really* slippery.  Normal motor oil wouldn't make the screwdriver
>'squirt' out of my grip, but the STP certainly did so.  Something besides
>just thick oil in there, I think.

I use Mobil Vactra No. 2 Way Oil on the bed of my lathe (which is
what it's meant for).  One of its major attributes is to greatly
reduce "stick-slip" friction so you can move the lathe carriage
smoothly from rest even under considerable cutting pressure.  I
haven't tried your screwdriver test on it but I bet it would behave similarly.

I don't use it on the spindle and other rotating parts of the lathe,
and I don't put it in engines.

Yours,
David