Midrasch zu Schemot 29:40

1) (Vayikra 6:14) ("On a griddle with oil, shall it be made; soaked shall you bring it; well-baked, a meal-offering of pieces shall you offer it, a sweet savor to the L–rd.") "On a griddle": We are hereby taught that it is a (ministering) vessel. "with oil": Oil is to be added to it (above the amount for the griddle offering of an Israelite). I would not know how much (oil to use). I, therefore, induce: This requires oil and the libation meal-offering (Shemoth 29:40) requires oil. Just as the libation meal-offering (requires) three logs for the issaron (viz. Shemoth 29:40), this, too, requires three logs for the issaron.

6) "zach": It must be pure. "katish" ("crushed") R. Yehudah says: There are no "crushed" olives except those pounded (in a mortar). "katish": (It must be) "crushed" for the light (of the menorah) but not for the meal-offerings.