Gemstone Hardness. The Mohs scale of mineral hardness was created by German mineralogist, Friedrich Mohs, in 1822 to measure the relative hardness or scratch resistance of various minerals. He based it on ten readily available minerals. As it is an ordinal scale, two minerals must be compared to decide which is harder. The scale is neither linear nor logarithmic.
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To drain out the old motor oil, slide under the passenger side of the engine with the used oil catch basin, the 13mm socket and a 3/8 drive ratcheting wrench. The oil drain bolt is located on the passenger side of the black metal oil pan. Slide the used oil catch basin to just below the drain bolt.