I'm getting tired of seeing this get brought up every month or so everywhere BG3. It's usually the same three or four people as well and I don't generally see it here, but I'm going to post the evidence that THEY DO NOT EXPLODE PERIOD just so others can see the truth and not fall for any potential lies they'll see on this elsewhere. If you go into the battle logs and explode a nautiloid tank, you'll see a force-damage roll -> that's because it exploded. Firewine and oil do not explode. They ignite (shocking) and you take fire damage from being hit with literal fire. 1D4 fire. Do not let these lies continue perpetuating.
