The other side is a bolt. Only one side has the plastic cap (there are vent holes in it). But no dipstick.Did you check the other side? One side is probably the vent/oil cap and the other will be the dipstick.
Mine is the same way, although different brand.
That's the bolt with the dipstick. Pull it out and it will reveal the dipstick.The other side is a bolt. Only one side has the plastic cap (there are vent holes in it). But no dipstick.