Abstract: A gas-oil mixture aid which comprises: a first transparent main cylinder having indicia lines marked or engraved thereon at a plurality of levels from the base; a second, smaller transparent cylinder having similar lines engraved or marked upon it, said lines on said smaller cylinder corresponding with the lines on the larger cylinder; said second cylinder adapted to clip to the side of said first main cylinder to permit said sets of lines to register one with the other; said second cylinder being selected from a group of three similar length but varying diameter cylinders, each of said cylinders adapted to hold oil to be mixed with gasoline in said main cylinder in one of three standard gas to oil ratios commonly in usage. Means are also provided to encase said main cylinder in a rigid protection carrying and dispensing means which may be provided with an agitator to insure proper mixing.