Good question, Ervin! I think using the term ''O.K.'' in the title of the thread can be confusing. Of course, we know that lying is a breach of the Precept and will have its kammic result. We know that we may lie in certain circumstances – e.g. to save our own life or the lives of our children. But it is never ''O.K.'' and will always have kammic consequences.
As well, lying is a slippery slope if done frequently. It leads to more lying and excuses to justify it.
There has been lots of previous discussion in this thread, which you may find useful.Is it ever O.K. to lie? viewtopic.php?f=42&t=8273