1994 BMW 840

Engine Mechanical problem
1994 BMW 840 V8 Two Wheel Drive Automatic 200k miles

On starting my 840 I have white smoke from the left exhaust. I have found a product called SEAFOAM? Which is a cure?
Also can a MILEAGE MAXX VORTEX GENERATOR increase fuel economy.
My question is do the above products work? Or am I wasting my time trying to improve fuel economy from a V8!
At present I am getting 12mpg in town and 25 on the motorway.
November 29, 2008.

Dont waste $$$$$$$ on mileage enhancing gimmicks. The white smoke might just be condensation, if it gets worse let's get back together.

Dr. Hagerty
Nov 29, 2008.