[MrBonus]

Originally Posted by Jdub

I am told to do this just before an oil change in order to remove the impurities that these chemicals dump into the oil once removed as sludge from the engine. Always a good idea to use Stabil or similar to reduce (but not prevent) the buildup of gummy residual nasty old gas.

I chose to do it now as my car will get its annual oil change in a few weeks. I try to remember to throw Stabil in the tank over the winter but our winters are often so mild that I rarely get more than a week or two where salt is on the roads.