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Review on Mastercool 91049 32 6 Black Yellow Solvent by Sheri Zhao

Revainrating 1 out of 5

Turned my old oil into sludge

Was difficult to use. Being citrus-based might be a "green" idea, but originally it just solidified the oil that was present. This made it VERY difficult to get everything out of the cores. Even after standing overnight, the old oil did not dissolve. I had an old bottle from another brand that worked well enough to remove the sediment caused by this product.

Pros
  • Effectively removes dirt and sludge from A/C components
Cons
  • Unbelievable price