What is NOT a true statement about using sealants when assembling a transmission?

The statement that sealing surfaces should be free from grease and oil is fundamentally accurate in the context of transmission assembly. Properly preparing sealing surfaces is critical for ensuring a reliable seal, as contaminants like grease and oil can interfere with the adhesion of the sealant and lead to leaks.

When properly addressing the correct answer, it is important to evaluate the other statements. Examining sealing surfaces for damage before assembly is essential to identify any imperfections that might compromise the integrity of the seal. Additionally, using an oxygen sensor-safe sealant is important in areas where the sealant could come into contact with engine components that are sensitive to certain chemicals. Finally, understanding that sealant should not cure at all before assembly emphasizes the necessity of applying the sealant in a manner that allows it to create a proper bond without prematurely hardening, which ensures a better fit and seal during assembly. This highlights the precise conditions under which sealants should be applied for optimal results. Therefore, the understanding of why sealing surfaces must be free from contaminants aligns with best practices in transmission assembly.