[Vwdiesel] Risks of straight weight

[Val Christian]

> 
>  They took a quart of oil, used in 
>     corporate fleet equipment, and stirred in a pound of "fines"
>     which is another way of saying dirt and soil and sand.
>     At 70F, the oil held the pound of "stuff" and visibly flowed 
>     OK, and I was told would wear test acceptably.
> 
>     The oil was chilled to 0F, and it was like tar.  I was told 
>     that the same oil, at 0F would only hold about two table
>     spoons of dirt.  Something like a 30:1 different going from
>     70F to 0F.
>  
> *********************************
>  
> Val,
>  
> What does it mean that the oil wouldn't hold the fines at 0F? Where did the excess go & how do the fines or absence thereof effect wear test?

	My take is that you don't want dirty oil when it's cold.

	If I'm going up north in Jan or Feb, I change the oil first.

	Mostly, I just found the demonstration very impressive.  I didn't
	know that a qt of oil would hold so much stuff.  And I didn't 
	realize how quickly it precipated out as the temps dropped.

>  
> Two years ago I was using 15w40 all year. (91 Jetta 1.6 N/A) I do all highway driving and changed oil & filter every 3,000 miles. At the 3,000 mile point that oil was beat. I could hear it in the engine. Lots of internal clattering and occasional intermittent lifter collapse at idle speed. 
> WalMart sells Mobil1 for $21 US for a 5 quart bottle. After 2 years and using only my back yard perceptions, I think it is better oil than any dino oil I have ever used. Starts in cold (-20F) are instant. Cranking speed is the same as it is in summer. After 4,000 miles internal engine noises are about  the same as when I first dumped it in.  
> I suppose I won't know about sludge and swarf internally til it's time for rebuild, but synthetic oil has a good reputation in that regard. We'll see. So far, I'm impressed.

	Why wait?  How about popping the valve cover?  Or putting a small 
	inspection mirror in there, to see what the cyl head top is collecting?

	What interval do you use with the Mobil 1?  Any oil condition
	testing (poor man's blotter, even)?

	If I had an engine with allot of blow-by, and perhaps marginal 
	compression, I'd be less inclined to use synthetics.

	Mobil 1 is a well regarded product, and I'm sure it will do 
	well for you.  Any more data to share with us on your experience?

	Val

	
>  
> Bob in the Entire State
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