>
> Is there really any difference though i cant see BMW or any of the
> other manufacturers having special oils blended just for thier
> vehicles, the cost would be prohibitive when you can set oils off the
> shelf that will more than fit the bill
Are you kidding ????
Nearly every manufacturer have their own oil specs which are on top of
the viscosity spec.
EG:
VW: 504.00 507.00 for their latest cars.
503.00 not to be confused with 503.01 which are not cross
compatible, BAM engines need 503.01 not 503.00, unless NOT on extended
service schedule, then 502.00 is OK.
506.00 the list goes on and on.
BMW: LongLife 98 LongLife 01 LongLife 01 FE LongLife 04
Ford, FIAT, Citroen / Peugeot, Porsche, MB ( the list goes on) all have
their own oil requirements.
You will find that oil makers offer the same grades for different
vehicle manufacturer specs.
Castrol, Total, Shell, Mobil, Comma, Fuchs, Motul all offer the same
viscosity grades with different car manufacturer specs on them.
What I am trying to state is that they all offer the same viscosity oil
(say 5w/30) in a range of different vehicle requirements.
Total offer the 5w/30 for a BMW, a different 5w/30 for Citroen / Peugeot.
Castrol offer a 5w/30 oil for VW and a different 5w/30 for Ford
These are just examples and not limited to.
HTH (but it won't)
David