ForTwo L3-1.0L (2009)
having a high viscosity index. These low-viscosity multigrade oils have lower viscosity-related friction and flow losses and good cold starting
properties due to their improved cold flow behavior.
On the other hand, these low-friction oils must not have a viscosity that is too low in the high-temperature range because this in turn could
increase the proportion of mixed friction and wear. During the warm-up phase, e.g. with mainly city-center traffic and low oil temperatures,
fuel savings are possible with low-friction oils. With increasing distances, the fuel savings effect is reduced.
With regard to the level of savings that can be achieved specifically with low-friction oils, there are publications with very different
examination and test results, which in part go far beyond the actual savings for driving in practice.
In addition, the additional costs of these products in turn can consume potential fuel savings to some extent (cost/benefit ratio). It is therefore
left to the vehicle operator whether he would like to use an approved low-friction oil due to the driving mode (short distance use, long
distance use).
2. Friction-reducing additives (friction modifiers)
In the low temperature range, where hydrodynamic lubrication in some engine components prevails, friction-reducing additives have no effect on
friction. Only under more or less mixed friction conditions, which occur in particular at high temperatures, with low viscous oils and under high
loads, can friction-reducing additives reduce friction. The effectiveness of other additives in the oil may also be affected, i.e. impaired, by the
oil-soluble additives, and therefore careful testing is absolutely necessary.
3. Special additives for lubricants for reducing friction and wear
For the operation of motor vehicles and engines, only blended oils are approved. These lubricants are produced from selected base oils (on a
mineral, partially or fully synthesized basis) by adding chemical oil-soluble additives and therefore have, in addition to a high lubricating effect, all
the properties demanded from a good lubricant, such as reducing friction and wear, corrosion protection, oiliness, dispersal properties and
detergency, a resistance to aging, foaming prevention, cold flow properties, etc.
From our point of view, there is no reason to add special additives.
Details are given in Sheet 219.0 of the Specifications for Operating Fluids (special additives for lubricants).