This product floats on water and can affect the oxygen balance in the water. The base oil contains less than 3% DMSO extract measured according to IP 346 and is therefore NOT classified as T / R45: May cause cancer "(Note L)." ENGINE OIL USED: Combustion products resulting from the operation of combustion engines contaminate engine oil during use. Used engine oil can contain dangerous components that can cause skin cancer. Frequent or prolonged contact with all types and brands of used motor oil should therefore be avoided and a high level of personal hygiene should be maintained.