I always give my machines regular oiling - the Bernina has loads of oiling points! But, the Pfaff 1475 says it doesn't need oiling.
However, I do oil the bobbin race, and the exposed shaft, although I don't do anything invasive...
I'm running low on machine oil, as I can't find the litre bottle I bought before lockdown. Many years ago, on the old forum, someone (sorry I forget who), said that gun oil is a good substitute, as it is a this oil.
At the end of the day, I work on the principle that some oil, is better than no oil at all, although some thicker oil would tend to go claggy.
Jessie