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Re: Dino juice

  My understanding is that the natural voscosity ranges of synthetics
  negate the need for viscosity improvers and hence the wide range
  and long drain intervals are possible. I let the Castrol GTX go for
  ~5k mi in the ur-Q, where I only let the rotten dino juice go 2k mi.
  I'll let the GTX go indefinitely in the '84 4KQ, unitl it's down a quart,
  then change it, often >10k mi at ~160,000 miles. The QTW gets a
  change every spring & fall, regardless of mileage, but well under
  10k mi.