Motor oil should be translucent golden honey or brown to deep brown in color, not black, gritty, frothy, or gelatinous.
If there are no instrument panel warning lights or performance issues the suggested emissions service is superfluous, money down the drain.
Most service writers work on commission. The more they sell the more they earn. They cash in on customer trust and automotive naivete by up-selling services, many of questionable necessity and value.
You might want to look around for an established independent repair garage. Avoid franchised repair and tire shops.