Silverscout,
thanks for your posting,
the builder gave you the correct information; when the latest api (American petroleum institute) rating on gasoline engine oil (sm) came out in late 2006 (for 2007 & newer vehicles), the amount of phosphorous (extreme pressure agent), zinc (friction modifier) and calcium (detergent/dispersant) were reduced dramatically. This was pressured by the epa which wanted catalytic converters to last more than 120,000 miles.....it was found that zinc in larger quantities in the oil poisoned cats, however, if a cat doesn't last more than 120,000 miles, something else could be wrong with the engine, the emissions system, or the exhaust system - including oxygen sensors. Jeff has a write up on this which I did back in early 2007, you can read it at the store section, engine, then go to where you see the image of swepco products and click on the "306" engine oil.
Besides the gasoline service rating changing, the diesel service level also changed at the same time. The new diesel rating is "cj-4" and it also has reduced additives.
Swepco also manufactures the sm/cj-4 oil in either 303 or 308 products, but recommends using the 306 sl/ci-4 oil formula in all engines prior to 2007 for the best protection.
Flat tappet cams in older and in high performance engines are particularly prone to experience high, premature wear, some even failing on the dyno when using the newer oil.
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as far as the transmission/transfer case requirements go, I do not have a listing for those, do you know what the manufacturer calls for? Quite a few newer manual transmissions and transfer cases call for an oil which is similar to atf, generally it is somewhere between a 20 & 30 wt product. I have several customers who use our 714-20wt atf with great success, however with hard use, the 30wt would probably be a better choice.....so, if your transmission calls for an "other than a gear oil" product, one of these would probably do a very good job for you. I am an "old-school" type person who believes that engine oil is for engines and transmission oil is for transmissions.
Swepco technology is such that their transmission oils, both atfs and gear oils contain extreme pressure additives for added protection. There May be an issue with using "other" oils if the transmission contains yellow metal (bronze or copper) especially in the syncronizers. The e.p. Additives in other oils will attack the yellow metals and can cause an eventual failure. The e.p. Additives used in swepco products are compatible with yellow metals and have been the choice of many race teams as well as individual pleasure vehicles for decades.
If your tranny & transfer case call for gear oil and you are going to have severe service, I'd recommend the 210 - 80w140 gear oil in the tranny, t/f case and the differential, it is more energy efficient than even the 201 - 80/90 product is. Since it is a true multi-graded gear oil, you will start out with the lower viscosity oil and as your conditions need it, it will adjust to a higher viscosity as the temperatures dictate. I have customers who run nascar classic cars, sprint cars, stock cars, sand rails and dune buggies which use it in the differentials as well as the transmissions (except sprint cars which do not have trannies).
Also, for your information, 50 weight engine oil is the same viscosity as 90 weight gear oil, so putting a heavier oil in the box which calls for a lighter weight oil can cause stiff shifting, especially at start up when the unit is cold.
If you could give me the weight and type of oil the manufacturer recommends, I can be more specific.
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I'm afraid you have me, as in over 23 years in the business, I am not familiar with "toyota birfield." can you educate me?
The percentage of moly in the swepco 101 is unfortunately proprietary information. I can tell you that it is more than 2%. Anything much more than 2% is not considered practical. Molybdedum disulfide (mos) is only one of many additives used in the 101 moly grease. It has an lb/gc rating, which means it is rated for chassis lubrication as well as wheel bearings.
It is a non-melt grease and is suitable for most bearing and sliding applications.
When changing over to a different grease, especially in bearings, you should always make sure that all of the old grease is removed from the bearings, the cavities, races spindles, etc. Most greases are not compatible with one another, so they should never be mixed. In chassis applications, you have no choice but to grease at shorter intervals until the old grease has been purged out. A "runniness" May occur when some greases are mixed and as a result you will not get the better characteristics of either grease until it is purged out.
This got a little long, but I felt I needed to give you as much information as possible......hope I helped!
Dick floryanowich