[Vwdiesel] Synthetic Conundrum

[mark SHEPHERD]

I'm a little confused  are you saying tht synthetic oil get around the 
bearings quicker? 
I don't understand the link to lubricating the turbo...
Surely turbo doesnt turn until youve pulled off; and by then the entire 
system is pressurised even if you used honey? 
Unless you start your vehicle with your foot to the ground and rev the engine 
from start up! :o)

  The turbo starts spinning just about as soon as the engine fires.  Pull a 
hose and have a look.  I've had the outlet from it off and at idle there's a 
breeze blowing out at you....Hmm a 'fan' that can spin 20000 rpm or so and weighs next to nothing would probably turn if you blew on it; but does this imply there's bearing wear? or a display of low friction? Isnt there still residual oilleft in the horizontally oriented bearings; which sustains lube for the 1 or 2 second of deprivation?? ;o)Would it still spin if you were to look  down the pipe on the inlet[filter] side of the inlet.What kind of idle speed are we achieving?...   The faster your oil light goes out, the quicker 
oil will hit those bearings.  Three factors work for you there.  "Hang time" 
for oil, lubricity/resistance to shearing/whatever and how quick the system 
reaches pressure.  I believe synthetic excells over dino in all 3....So synth. is stickier? Less viscous when cold but more viscous when hot [in comparison with dino]Yet it shears easier? which conventional thinking makes me feel it is thinner? Name something else that is easier to stir yet thicker? Not paint any way ;o)Seems to be something out of science fiction... I see the winter benefits but is it neccessary in summer? I think the friction differences may be insignificant!Here's a simple test: take a spare rear wheel and hub/stub axle. Set it in a vice clean taper bearing and lube with dino.Spin wheel and count the turns before stationary. Clean bearing and lube with synthetic...Repeat test. Ok to be thorough; do it on hot days and cold days!Mark(The Miser)UK
 
> 
> Chris why do you get better mileage with synthetics...unless you are talking 
> about short journeys in Alaska?
> 

  Lower friction, lower viscosity, better mileage.  Same as using synthetic 
tranny fluid keeps the car from dying when you let out the clutch, in neutral 

on a cold winter morning.  Sure wish I'd had synthetic tranny fluid when I 
was driving the Mustang in the winter!
     Loren