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Alternative fuels: Types and their characteristics

It will be a long time before we are all travelling in electric cars or under hydrogen power. If Germany is to reach its ambitious goal of climate neutrality by 2050, alternative fuels will play an important role at least until then. Some of them are already widely used today in their pure form or as a mixture with fossil diesel and petrol fuels. Since 2007 the German Biofuel Quota Act (BioKraftQuG) has even stipulated a minimum share of biofuels as a percentage of total fuel sales in Germany.

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Discrepancies in the "Additives" section - do these indicate a mixture of two different types of oil?

For years we have always been using an oil from the same manufacturer with the same name and specification to lubricate our systems. It is regularly monitored with trend analyses. Oil changes are carried out on the basis of the suggestions of OELCHECK tribologists in the laboratory report. We have never noticed any abnormalities. However, the latest laboratory report now shows discrepancies under the heading “Additives” that do not fit with previous analyses or fresh oil.

Do the changed values indicate a mixture of two different types of oil?

What other reason could there be?
 

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The shear viscosity of greases

Unworked penetration and consistency


Every grease changes during use. It becomes softer or harder, depending on load and thickener. However, a solid or softened used grease can be dangerous for the lubricated element. This is why we determine penetration as part of the all-inclusive analysis kit 5. It provides information about this change and also enables the grease to be assigned to the NLGI consistency class. A change compared to fresh grease informs you, among other things, whether the grease can still be distributed well in a bearing or whether it has softened to such an extent that it bleeds out. To determine the unworked penetration, 3 ml of used grease is poured into a pot. A special cone is placed on its surface. Its penetration depth into the grease is measured after 5 seconds in 0.1 mm and specified as penetration. 

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