Engine knocking

[Kracka]

Before you go swapping lifters try a different oil (Shell Rotella-T or Chevron Supreme 10W-30 is my recommendation if you want a conventional oil, or Castrol Syntec or Redline if you go synthetic); and definitely use a Mitsu filter.

*edit* Use whatever weight is recomended in your owner's manual, I said 10W-30 based on the 4G63 engine.