I see. Back in march i used a quart of Rislone with shell 5w30 oil. I let my car idle for 15 muintes, digging ou snow, and the car ran terrible... driving, you would think the wheels were gunan come off or engine blow up!! NEver did that with oil! I drained it out yestereday with about 2,700 miles on, with the Rislone quart additive, and hacked open fram filter(orange)... The nedia held up good! But was near black. Bottom of oil filter, had what appeared ot be small tiny pieces or carbon or cardboard, couldnt tell. Ive used frams before and never noticed that, so was thinking the Rislone maybe degraded some of the cardboard endcapp off the filter media, maybe it was carbon. Rislone did eventually seem to work okay, easier start ups, ect outside o everything else. SO!! Made me think about the additive in title... see what everyon thinks.