3 Series E91 320i (N43) TOUR
-
Unproblematic mixability / compatibility:
All engine oils must be able to be mixed with each other to any degree, even synthetic with mineral oils, without
this resulting in any incompatibility reactions.
Another requirement is compatibility with all the materials wetted by the oil, in particular, seal materials, hoses
and paints.
-
High thermal conductivity / good cooling capability:
The oil also has an important role to play in cooling the engine. It must transport heat not only away from the
friction points, but also a major proportion of the heat generated during combustion, e.g. by means of splash oil
on the pistons and cylinder barrels.
-
Restricted tendency to form combustion residues:
When the engine is running, a limited amount of oil inevitably finds its way into the combustion chambers and is
combusted there. Residues that build up in the combustion chambers lead to an unwanted increase in
compression and encourage auto-ignition.
-
Long shelf life:
When stored properly in closed containers, engine oil must be able to be stored for a long time without suffering
any reduction in quality.
Not even very good base oils are able to fulfil all these requirements on their own. Oils for today's generation of
engines therefore contain a high proportion of carefully matched additives. It is these that bestow the required
characteristics on the oil.
Initial-running or breaking-in oils
Breaking-in oils, i.e. oils that provide extra protection against corrosion and better breaking-in characteristics, are to
be regarded as a special case with respect to operation and operating conditions, and are not intended for use in
Service.
Status 06/2005
SBS 1.0 General information
BMW AG - TIS
24.01.2013 22:05
Issue status (12/2007) Valid only until next DVD is issued
Copyright
Page - 2 -