Practice question

Why must the correct TES-approved fluid be used rather than a generic ATF in an Allison bus transmission?

  1. Generic ATF is always thicker and improves cooling
  2. Any red fluid is interchangeable
  3. TES fluid is only for cold climates
  4. Friction characteristics are matched to the clutches and incorrect fluid causes shift problems and wear

Answer: D — Friction characteristics are matched to the clutches and incorrect fluid causes shift problems and wear

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