Ok to grease Myford feedscrews?

During my training no one applied grease to any feed or leadscrews on any machine,and before any screwcutting you were expected to clean any swarf from the screw with a stiff brush and give the screw a couple of shots of oil from an oil can, 30 sae oil in those days,I use multi grade motor oil 20/50 on all my home machinery, one thing that I have found is straight 30 formulated for vintage cars of the 1920s does not mix with soluble oil .it causes my Colchester saddle to be stiff when when travelling along the bed, runs perfectly on multigrade. Even with my near fifty year old Myford where the leadscrew is also a feed screw I just use multigrade motor oil ,Castrol gtx, and I have no wear on the screws,though I do clean the leadscrew with an old tooth brush before oiling,though I rarely use the leadscrew for saddle feed, I prefer to feed by hand with saddle handwheel this keeps the lead screw accurate for screw cutting , regarding the Tecalamit oil gun supplied new with my S7 mine lasted for around 40 years and it was also used on the oil nipples on my Elliott mill and J & S 540 grinder cross feed.so I had no problems with my oiler it just wore out. If anyone aquire a 540 grinder,do not grease the the nipple on the cross feed hand wheel,it will stop the auto feed working, a J&S service engineer tonce old me that he had very many calls to fix the feed mechanism and all were due to grease being used,also the feedmechanism has a banana shaped bronze link if this is fitted upside down the feed only operates in one direction.