At 05:01 PM 5/11/2002 -0400, you wrote: >I am going to change from 10-30 to 30 weight and just wanted your thoughts. I have said it before, and I will say it again. There is a wide range of oils one can use, and his engine will be OK. The difference between a "good" oil and an "excellent" oil will only show many thousands of miles down the road, so your decision what oil to use now will affect you only in the distant long term. If you plan to keep your car indefinitely, it makes sense to invest in the "excellent" oil. Having said that, the multi weight oils are superior to the single weights in almost all respects (they represent a huge step forward in engine lubrication technology). Their superiority is more significant in the winter, but even in the summer there are advantages. The next important step in lubrication technology are the synthetic oils. These oils are for example what allows many manufacturers of modern cars to have engines that produce almost 100 hp/liter and still be reliable. If you plan to keep your car indefinitely, and especially if you like to drive it hard every now and then, its worth the extra cost. (why else would we want to drive a hemi or a 440 if you don't put your pedal-to-the-metal every now and then). I can live with the oil leaks if I know the engine will most likely last longer. D^2, 2 hard driven 68's with Mobil 1 15w50