I change my
oil before putting it away for the winter, or every 3000 miles. Just before I change it, I add a little Dexron II to the crank and run the motor up to operating temp. The Dexron will help get rid of any sludge. I'm not sure you have it over there in Oz, but I use Kendal GT1 Racing
Oil, 10W40. I have also used the Castrol GTX 10W40 and still do in my bikes. Actually, in my bikes, I use the 20W50, as per the manufacturers specs.
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"The 427 Cobra is easily the highest performance car ever sold for street use. A decent 427 - not the worst, not the best, will go from zero to 100 mph and back down again to zero in less than 14 seconds. All thing considered, you can put together a pretty good argument that the 427 Cobra is the ultimate performance car, judged on any basis you want to name." Taken from; Corvette, The Sensuous American
