man checking his oil level from old diesel engine

action antiwear area background burnt car checking closeup combustion contaminating cooling corrosion cycles detergents diesel dipstick dirty dispersants ecological effects engine environmental equipment facility fingers grip hand hands heating hood hydrocarbons impacts index inhibitors internal level lubricant lubrication maintenance male man manual mature mechanic mechanical motor multigrade oil old one outdoor parts petrol petroleumbased piston pollution process rim rings rising service sludge soil stained station surface transportation vehicles viscosity