The advice I was given when handling some of the books at the university of toronto's rare book collection was to simply not directly touch the parts that matter if it can be avoided. Turn pages via their margins.

Ripping is usually more of a problem than some finger oil and gloves makes you less sensitive and more likely to rip or destroy stuff.

>” Ripping is usually more of a problem..”

Accidentally ripping a page while turning the pages too quickly.