transferred from the inside of piston 1 through openings 8a and 8b and 8a 39 and 8b 39 see also fig4 the ejected lubricant is distributed over the cylinder wall in the area of highest wear in the lower section 12 of piston 1 there is second additional lubrication means 11 as indicated in fig1 b this feature is provided on the frontside and the rearside of piston 1 fig2 is an illustration of a partial cross sectional view of piston 1 through lubrication opening 8b vertical cut through the piston wall at the location of opening 8b in fig1 a piston 1 has a thick walled upper section 10 and a thin walled lower section 12 upper section 10 includes the recesses for receiving piston rings 2 and 3 and a recess for oil ring 4 opening 8b is connected via channels 20b and 21b to the interior of piston 1 openings 8a and 8b are connected via corresponding channels 20a and 20b and 21a and 21b to the interior of piston 1 to direct the oil into channels 21a through 21b open channels 30a 30b separated by rip 31 may be provided on the inside of the piston as shown in fig5 fig3 is a cross sectional view identified by 3 3 in fig1 a in fig3 lower wall section 12 of piston 1 includes a trough shaped lubricant reservoir 11 reservoir 11 may be fully recessed in wall 12 as shown in fig2 or it may be protruding into the interior of piston 1 reservoir 11 is a preferably square opening symmetrical to center axis 6 bottom 18 of reservoir 11 is concave to store a small amount of lubricant top 19 of reservoir.