[Werner]

Old Ugly,

MMO has two great characteristics. The ester oil is extremely temperature stable and supports the boundary lubrication on the valve stems and also the top dead center piston + cylinder.

The most important benefit is the addition of detergents. These loosen and burn soot and ash in the combustion chambers and on the valve tulips, spark plugs.

Since the old engines always burn a lot of oil and especially simple mineral oils leave behind a lot of residue crust, it is helpful to mix such additives with the gasoline in very small doses.

It also dissolves resin deposits etc. in the fuel tank and the pipes.