[Vwdiesel] Early 1.5 diesels

[LBaird119 at aol.com]

In a message dated 12/7/2009 5:50:02 PM Pacific Standard Time, 
cfgeiser at gmail.com writes:

> "but the real problem was that the heavy oil tended to coke up the rings 
> more than using light oil"
> 
> Do you guys think this was this from the weight of the oil as mentioned, 
> or rather lack of compression-rated oil?  
> Back before I was enlightened by you gentlemen I used a non-c-rated oil 
> and had poor compression by 300K miles in my jetta (91).
> I currently run synthetic 15w40 c-rated oil (Amsoil) in my next (92) 
> jetta; not far from the 20-50 mentioned by Val; and have 333K miles and 
> compression is great...
> 
> Chris 
> 

  Non-diesel rated oil really gums up the diesels, from what I've seen.  
It doesn't do any favors to gassers either.  It cokes up in the breather 
screen and on the rings, coats everything with that lovely brown 
color and so on.  15W/40 (and I'm sure any other diesel rated oil) 
doesn't coke up nearly as much (hardly at all really) and instead of 
rods and pistons being brown or black come out "fresh out of the 
hot tank" cast iron grey or durn near shiny, aluminum.  :-)  I'd say 
it's the application additives in the oil and nearly nothing to do with 
the weight, unless it's REALLY thin and doesn't give good cold 
start film.
    Loren