<https://mymotorlist.com/engines/mercedes/om636/#webpage>
<http://schema.org/description>
"The OM636 is a 4-cylinder, 4-stroke diesel engine. It was introduced in 1949. This engine has been installed in Mercedes-Benz passenger cars, vans and small trucks since the late 1940s. The weak point of the engine is the thermal overload of the cylinder head, since the bridge between the valves is too narrow and heat"
<https://mymotorlist.com/engines/mercedes/om636/>