I agree with you. That advice is especially true if the rifle has a stainless action and bolt. Oil, in my opinion, is not sufficient for SS when it comes to the bolt. Stainless is softer than carbon steel and locking lugs need a good quality grease on them to keep from galling when the bolt is opened and closed. Not much but sufficient to keep them lubricated when hot. I have used so many different types of oil on rifles over the decades I lost track. Virtually all worked satisfactorily. My bolt action varmint rifles are a combination of either Rem 700 actions or SS Batt actions and I have never used anything other than a light dab of Lubriplate grease on the bolts and they all are just fine after thousands of rounds on some of them. I remember way back my dad, who was a master machinist, told me that if it slides, put grease on it and oil on the rest and I never forgot it. Oddly though, when I was in the Army we used to dump motor oil on the bolt in our M85 and M2 50 cal's in our tanks to keep them firing. Some folks did the same in the 7.62 coax as well. Worked fine but made a big mess.Get half an old cotton sock, well washed and dip it in enough auto transmission oil to barely leave a trace on glass. Wipe down the gun inside and out with that rag and then apply any good grease with the tip of a toothpick to the rear of the sear, the cocking ramp and the extractor cam. The left-overs from that one dab of toothpick grease goes on the back of the locking lugs.