I got some of this goo (heavy cyclic polar naphthenic?) to add to the subaru fill BC the havoline is proving to be a tad too thin and the engine is knocky and down on power and torque. I was hoping that this stuff doesnt have any EP or detergents and similar the old Motor Medic I have used as a thickener. I just got the msds and it does list the seal conditioner - similar to plasthal DTDA ester but no metal compounds. I wanted an add oil that wouldnt confound the additives in the havoline/chevron 5w-30. I warmed the stuff in a pot of hot water for a 1/2 hour to make it "somewhat " easir to pour. Still A honey warmed! Added it ( ~4 oz) to a hot crank case and washed it down the filler tube with a few oz of the 5w-30 and took her for a 5 mile spirited spin. Seemed to do OK so far. Lets see how it will cold start tomorrow at 15 deg F!