At 02:30 PM 1/11/2002 -0500, you wrote: >Proline Oil Additive..cost..$0.99...probably will cost me hundreds on >repairs....using 40w...now...but 30w...before screw-up.... What does the can say the additive is supposed to do? I doubt it will make much difference now, but you should avoid using single weight oils. A 10w30 or 20w40 is much better than 30w or 40w. Even if the car was built at a time when these oils were recommended, the times have changed and the oils are so much better now... D^2