I haven't yet used passenger car motor pil for forearms lubricant, and I personally never will. There's a boatload of additives added to yransform the base pils supplied by refineries & chemical plants to turn it in to an effective lubricant in direct exposure in combustion chambers that don't do anything WRT arresting metal oxidation at ambient temperatures. Some of these could be viewed as suspended rather than dissolved per se. Detergents, bases to neutralize combustion gas acidic components (calcium sulfonate is one example), dispersants to keep the crud in suspension between oil changes, etc. There's a LOT of sulfur compounds added even to that oh-so-clean Pennzoil Platinum base oil made from natural gas, and the hydrogenated 1-decene component of Mobil 1. These additives are why re-refining used crankcase oil only yields about 60% "re-seperated" base oil. Those various additives are about 25% of the lubricant by volume and are left with just enough carrier oil to keep the mix homogeneous and pumpable. That 40% winds up blended into asphalt and/or blended into heavy fuel oil like cargo ships and some power plants burn. Even then it's blended at a very low ratio, typically 3% max, into such fuel oil due to problems those additives create in the furnaces or engines that use that fuel.
I too have changed oil and other automotive fluids from before I was old enough to drive with my father teaching me and I still habitually don't wear gloves doing so. It's not "best practice" and I'm fully aware of that and know I'm making a conscious choice not to wear gloves for such DIY tasks. If I'd done that on the property of any of my employers after I finished college I'd be a candidate for a safety and industrial hygiene intervention. I do it at home where it's my own business.
But I'm also not a technician at Jiffy Lube with a new crankcase full of way warm used lubricant above my head every 10 to 20 minutes to drain day in day out. I put my truck up on ramps, 4 if I'm working with the transmission pan as my "poor boy" lift, and only mess with any of that when everything is at ambient temperature. Intermittent acute exposure with long breaks between events vs chronic exposure at elevated temperatures.
Like so many things, YMMV