There are tougher gloves out there too, greasemonkeys n such, but yeah sweat is an issue. I used to use them more regularly, when the boss was paying for them now all I wrench on is my own stuff and I keep forgetting to buy gloves lol.
I go through a lot of gloves at work (semiconductor processing cleanrooms). I have an endless supply of 'only used once' gloves. I exit the cleanroom, take mine off and toss them in a bag to take them home. Nice nitrile gloves with decent thickness. I just have to remember to use them.
I keep a box on my cart. I got used to wearing them in the shop where they were providing. Gloves are a good idea, almost everything a mechanic works with is a carcinogen. The skin is the largest organ of the human body, and it’s a sponge.
On the glove question, I swear by Gloveworks diamond textured gloves. These are on the thick side (8 mil) which maybe takes a bit to get used to the reduced tactile sensations, but I've been wearing them so long I'm used to it at this point.
The diamond texture is supposed to help with grip, primarily, but what I like them for even more is that texture on the outside means there are numerous small pockets on the inside (underside of the diamond grip bits). Those numerous tiny pockets are going to trap tiny bits of air, making for far less sweat build-up than any other nitrile I've used. I won't use any other style of glove after finding these.