API-TC

API TC is a certification for two-stroke oils, awarded by the American Petroleum Institute. It is given after the product passes through stringent tests that determine the level of detergent performance, dispersion, and anti-oxidation. It is the only remaining, not revoked classification of the API Two-Cycle motor oil specifications (TA, TB, TC, TD). Being a very old standard itself, most currently produced 2T lubricants meet its specifications, even the lowest quality ones; current high-quality oils exceed them (often labeled "API TC+" although not based on actual measurements).

The more current JASO M345 or the international ISO two-cycle oil specifications are much better indicators of oil quality, with requirements based on modern two-stroke engines and environmental policies.[1] API-TC has been removed from the API website.

A higher grade, TD, was considered similar to the National Marine Manufacturers association (NMMA) "TC-W" (water-cooled outboard engine) grade. The NMMA has now replaced this specification with the higher TC-W3 standard.[2]

References

  1. ^ "ISO Two-Cycle Oil Specifications - oilspecifications.org". www.oilspecifications.org. Retrieved 2022-04-14.
  2. ^ "API Two-Cycle Motor Oil Specifications - oilspecifications.org". www.oilspecifications.org. Retrieved 2022-04-14.


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