The CIR has likewise declared SLES and Ammonium Laureth Sulfate safe in cosmetic formulations. In higher concentrations, SLS and SLES can cause dermatitis and eye irritation, but no research has suggested any link to other medical disorders. The real worry about SLS lies in its power over other chemicals in SLS-based products. A rigorous background check of shampoo's supporting players is definitely in order.
Conventional oils contain impurities that build up, forming deposits in the car.
Synthetic oils, by contrast, keep the engine clean and generally free of debris, and can stay on the job three times as long. But synthetics are also more than three times more expensive. Whether it's worth the expense is a subject of frequent, inconclusive debate among enthusiasts. Notably, one Corvette's warranty is voided if conventional oil is ever used. When your car's engine is badly worn or out of tune, the tailpipe emissions of such noxious byproducts as carbon monoxide, hydrocarbons and particulate matter are greatly increased.