Q: Are all two-cycles oils marketed for my engine the same?
A: No. But if you select your oil by the NMMA or API identifications discussed above, you are less likely to make the wrong choice. Oils that have successfully passed the NMMA or API requirements for TC-W3 should display the symbol and indicate the license number somewhere on the package. If one of these designations is not shown, the oil may not meet the specification and has not been licensed or approved under the NMMA or API.
Q: Who is the authority for clearing two-cycle oils for sale?
A: For two-cycle oils identified as TC-W3, NMMA licenses a supplier based on data submitted from test procedures. For oils labeled TC, claims are made based on guidelines defined by API. For oils that do not carry either of these designations, you have only the claims made on the container or accompanying literature. In short, products without these designations are not monitored or approved two-cycle products under NMMA or API for entry into the marketplace. Therefore, consider trusting a supplier brand of proven performance when making a decision to buy.
Q: My mechanic/dealer tells me I must use only the OEM oil brand that matches the brand of equipment I have or my warranty will be void.