Sorry Larry  :-)

(Note to self: no typing after being awake more than 20 hours.)

You'll find that 2000 miles of a synthetic blend or synthetic oil will do a
decent engine cleaning as well - it's the combination of fresh detergents
and the extra cleaning ability of synthetic base oil.

This info from Chevron:
http://fileserver.urimarketing.com/ChevronOronite/IndustrialSpecificationHan
dbook/Red3_files/frame.htm
http://fileserver.urimarketing.com/ChevronOronite/Automotive%20Trends/Specs2
_files/frame.htm

Note the differences between lab and test cell evaluation of engine oil and
ATF. See how engine oil has both detergency (via deposit evaluation) and
dispersancy tested, while ATF isn't evaluated for cleanliness?

Engine Oil - API SL/ILSAC GF-3

Lab Tests:
Viscosity
Volatility
Foaming
High Temp Foaming
Deposits
Gelation Index
Homogeneity & Miscibility
Filterability

Engine Tests (test cell):
Fuel Efficiency
Dispersancy
Dispersancy/Wear
Oxidation
Rust
Bearing corrosion

Automatic Transmission Fluid - Dexron III

Lab Tests:
Viscosity at -40C, -30C, -20C
Flash Point
Fire Point
Color (must be red.)
Miscibility with reference fluid (checks compatibility)
Foam control
Copper corrosion
Vane pump wear test
Seal compatibility

Test Cell:
Plate friction test (100 hour) (with wear evaluation)
Band friction test (100 hour) (with wear evaluation)
Oxidation Stability (300 hour)
Cycling test (computerized transmission - 20,000 cycles of shifting)
- End of test viscosity at 100C and -20C
Vehicle shift performance test
Sprag wear test


Andy Hecker
San Antonio


Thanks  Andy....
And if you can read that in one breath......
The high detergent makes sense, as we have also used ATF in piston engines
to clean sticky hydraulic lifters. Just replace half the oil with ATF, drive
for a day, drain and replace with fresh oil. No more tick... tick.... tick!
Larry


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