<VV> A slightly corrected part 2

BobHelt at aol.com BobHelt at aol.com
Sat Sep 20 01:33:01 EDT 2008


 
NON GF-4  OILS 
Non GF-4 oils are all the other viscosities. That includes, for example,  
10W-40 and 20W-50. These oils are all rated SM (latest rating). The letters SM  
will be stated in the top portion of the donut on the back of the container.  
Since these oils might include racing, high mileage or diesel categories, the  
committee set the following phosphorous requirement for all of these oils. A  
minimum SM phosphorous requirement of 600 ppm, and any amount of phosphorous  
greater than the minimum for the upper limit. There is NO phosphorous upper  
limit in the specification. But of course an application limit will be set by  
the oil producer. Again, there is no requirement of any zinc content either.  
There will be no Starburst or “energy conserving” on these  containers. 
OVERLAPPING  RATINGS  (E.g. SJ/SM or  CI-4/SL) 
Here is where the confusion begins. Let’s look at some examples. Consider  an 
SM rated 10W-30 oil (or 5W-20 too). Here we have conflicting specs. 10W-30 is 
 a GF-4 oil with reduced phosphorous but SM has no upper limit. So the GF-4 
spec  takes precedence and establishes the upper limit of 800 ppm. (The SM spec 
upper  limit is simply any amount greater than 600 ppm.) Thus, this amount of 
 phosphorous (anything over 600 ppm) meets the SM spec.  
Now  consider a 20W-50 oil with an SJ/SM rating in the donut. SJ has an upper 
phos.  limit of 1000 ppm and SM has no upper limit. So this oil will have a 
maximum  phos. Of 1000 ppm. But what if this were a 0W-20 oil with these 
ratings? It  would require that the GF-4 spec be met with an upper limit of 800 ppm 
phos.  despite the SJ/SM ratings. 
Similarly,  CI-4/SM in the donut (a diesel oil) will have 1400 ppm phos. 
since this will  also meet the SM spec of no upper limit.  
But to  be sure we cover all bases, let’s look at an oil rated CI-4/SL. 
(Another diesel  oil). Here is where the specs cause problems. The upper phos limit 
of CI-4 is  1400 ppm but the upper limit of SL is 1000 ppm. (Note that the 
CI-4 1400 ppm is  an upper limit and not a required amount) So an oil with both 
of these rating  will have no more than 1000 ppm phos. to meet the SL 
designation and still will  meet the CI-4 spec. 
Regards, 
Bob  Helt



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