抄録
The effects of STP additives were tested on six engines for farm use, in which STP was added 20% to oil and 0.5% to fuel respectively. The increase of shaft horse power of engines were 4.8% (at maximum) to 0.2% (at minimum). and mean value was about 2%. The cause of these power increaments were supposed that STP maintaines a betterseal between the engine cylinder and the piston rings in high compression engine at high speed.
