# API-TC

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{{Short description|Certification for two-stroke oils}}
{{More references|date=February 2021}}
'''API TC''' is a [certification](/source/product_certification) for [two-stroke](/source/Two-stroke_cycle) [oils](/source/Motor_oil), awarded by the [American Petroleum Institute](/source/American_Petroleum_Institute). It is given after the product passes through stringent tests that determine the level of [detergent](/source/detergent) performance, [dispersion](/source/Dispersion_(chemistry)), and [anti-oxidation](/source/Antioxidant). 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](/source/JASO_M345) or the international [ISO](/source/ISO) two-cycle oil specifications are much better indicators of oil quality, with requirements based on modern two-stroke engines and environmental policies.<ref>{{Cite web|title=ISO Two-Cycle Oil Specifications - oilspecifications.org|url=https://www.oilspecifications.org/iso_2t.php|access-date=2022-04-14|website=www.oilspecifications.org}}</ref> API-TC has been removed from the API website.

A higher grade, TD, was considered similar to the [National Marine Manufacturers association](/source/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.<ref>{{Cite web|title=API Two-Cycle Motor Oil Specifications - oilspecifications.org|url=https://www.oilspecifications.org/api_2t.php|access-date=2022-04-14|website=www.oilspecifications.org}}</ref>

==References==
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Category:Lubricants

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Adapted from the Wikipedia article [API-TC](https://en.wikipedia.org/wiki/API-TC) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/API-TC?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.