Let's Look...
Maybe if we can get some info together on Schaeffer's 5W-40 we can show Alex how to evaluate the available products.
In general, Schaeffer makes synthetic blends and uses molybdenum as an extreme pressure additive. They may have gone to a 'synthetic' of some type in the 5W-40 (which could mean all Group III, or some other variation of GIII, IV and/or V).
This is one of the companies that uses the Timken Extreme Pressure test (designed for gear lube and EP grease) to market their products. The problem with this 'test' is that it's not designed for engine oil, engine oil in general doesn't use EP additives because engines don't need them. Both Schaeffer and Royal Purple reps crank on the machine until the metal is digging away and smoking. Impressive demonstration for a farm show, but useless for demonstrating real oil performance. If you ever come up on this test by an oil or additive vendor, bring out a little bottle of Head and Shoulders shampoo (smells better) or bleach or phosphoric acid (or some Coke). These will beat any oil on the market in this 'test'...
[For more info on the use of the Timken EP test, reference this article from Machinery Lubrication magazine, written by Mr. Ludwig, Chief Chemist/Tech Director of Schaeffer. From the article: "
Any test results that are obtained by the use of this test method have been found not to correlate with results obtained during field service."]
http://www.machinerylubrication.com/article_detail.asp?articleid=616
Who wants to post a link to the company's spec sheet for the 5W-40? The MSDS? Who wants to contact the company and ask whether the oil is a blend or synthetic (and whether it's Group III only, or contains other synthetic base oil)?
That should be a start. Then we can look at the specs and see if it looks ok or if there appear to be conflicts.
Andy