I had a 1990 300zx Na for years I used Redline in it, the car had 132,000 miles on it when I just recently sold it (running fine) At one point a couple of years ago I switched to Pennzoil 10-30 and sometime after that I did notice "ticking" sounds comming from the engine. I thought it might have been something else, but now that I have read this post there is a good possibility that my switching to a less expensive oil my have been the difference. as soon as my 370z is broken in, redline is the oil thats going in it.
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