http://www.qualityimports.co.nz/tufoil/tufoil_info.htm
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>
5. 4 BALL WEAR TEST ASTM D4172 40KG, 1200 RPM, 167°F, 1 HOUR
(1 PART TUFOIL 20 PARTS 10W40 MOTOR OIL)
Results. Average Wear Scar Diameter. mm = 0.43<HR></BLOCKQUOTE>
This is an example of what I've noticed tufoil does. They take industry
standard tests and use them in ways that are not correct, but the
changes they make, make their product look better then it is.
They run the 4 ball test at a lower RPM and lower temp then what oil companies do. Thus inflating the numbers.
Amsoil is more honest in this way and when they do this test at 150 C not 75
C, and run it at a 1800 rpm, they achieve wear scars between 0.30mm
(20w50 series 2000) to 0.39mm (most of the other oils they make achieve
this number). So under WORSE conditions, it ends up producing a smaller
wear scar. 150C is a more relevant temp to run the test at since this is the temp that the oil will see between the bearings when the rest of the oil is at normal operating temps ( around 90-100c )
The trend I noticed was that they run all the tests in non standard
ways, and at LOWER temps. Temps not seen in an operating engine. I
honestly believe this is because of what I mentioned about what happens
to PTFE when you use it at temps above 100C.
The wear scar they achieve could be achieved with any normal mineral
oil at that temp and rpm. The trick it to achieve a wear scar of that
number or less once you've raised the temp and rpm.
Another issue is that when you factor in the price of the Tufoil, you could have purchased a good synthetic oil in the first place.
http://www.tufoil.com/coupon2.htm
$39.95 us per quart!
Your supposed to use 8 oz for the first oil change, and 4 oz for each oil change after that. They recommend normal 3000 mile oil changes. That makes this product more expensive to use then synthetics oils which would give you better protection. Duh.
------------------
My Project GTD and diesel page
http://kozmik.guelph.on.ca/gtdproject
[This message has been edited by Dominique Cormann (edited April 04, 2000).]
[This message has been edited by Dominique Cormann (edited April 04, 2000).]