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Two engine oil additives with graphene were tested in diesel engines. The
first was a graphene oxide (GO)-based, commercially available additive that the supplier
recommends using at a 3% v/v concentration in engine oil. The second was a graphene
nanoplatelet (GNP)-based additive that is under development, which is more concentrated
and allows for the addition of a much smaller amount of additive. Using the GO additive
results in a reduction of brake-specific fuel consumption from 0.2% to 0.7%, depending on
the engine load, and a 2% reduction in fuel consumption when the engine is run without
load. The use of 0.1% wt of GNPs led to 0.4% of fuel savings on an ESC emission cycle.
Increasing the GNP concentration to 0.2% did not further reduce fuel consumption.
