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Gesekan selalu ada dalam suatu sistem mekanikal. Oleh karena itu diperlukan langkah-langkah untuk meminimalkan gesekan, sehingga pemakaian energi menjadi lebih e¿ siensi.Makalah ini membahas pengaruh penambahan aditif pemodi¿ kasi gesekan serbuk MoS2 ukuran 1,5 —m dengan jumlah mulai 0,05%; 0,1%; 0,5%; 1% dan 2% berat dan ukuran 90 nm sebesar 0,05% 0,1%; 0,5% pada minyak lumas dasar mineral HVI 60, terhadap karakteristik gesekan dan perlindungan keausannya. Aditif ukuran 90 nm dan minyak lumas dasar dicampur dan diaduk menggunakan magnetik stirrer selama enam puluh menit pada suhu 50oC setelah itu dimasukkan ke dalam ultrasonic homogenizer selama satu jam, sedangkan aditif ukuran 1,5 —m pada suhu 75oC tanpa menggunakan ultrasonic homogenizer. Campuran yang dihasilkan diuji karakteristik gesekan dan perlindungan keausannya menggunakan mesin uji four-ball dan mesin uji SRV. Analisis dilakukan pada goresan permukaan bola uji menggunakan scanning electron microscope (SEM). Hasil penelitian menunjukkan bahwa penambahan aditif meningkatkan perlindungan keausan dengan dosis optimal sebesar 0,1% berat dengan rincian ukuran 1,5 —m perbaikannya sebesar 23% dan ukuran 90 nm sebesar 11%. Pengamatan permukaan goresan menunjukkan mekanisme keausan terjadi secara adesif dan abrasif. Data yang diperoleh dari penelitian ini bisa digunakan sebagai dasar dalam pembuatan minyak lumas yang bisa meningkatkan kinerja mesin.

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