There is sufficient evidence of the carcinogenicity of mineral oils that have been used before in internal combustion engines to lubricate and cool the moving parts within the engine.
Tá dóthain fianaise ann maidir le carcanaigineacht na n-olaí mianracha sin a úsáideadh in innill dócháin inmheánaigh chun na páirteanna a ghluaiseann laistigh den inneall a bhealú agus a fhuarú.