See also:

Materials Added To Engine Oils
Do not add any supplemental materials, other than leak detection dyes, to your engine oil. Engine oil is an engineered product and its performance may be impaired by supplemental additives. ...

Maintenance
CAUTION! Do not use ethanol mixture greater than 85% in your vehicle. It will cause difficulty in cold starting and may affect driveability. ...

Brake Master Cylinder
The fluid in the master cylinder should be checked when performing under hood services or immediately if the “Brake Warning Light” is illuminated. Be sure to clean the top of the master cylin ...