This article first appeared in the AMSOIL DIRECT LINE newsletter on April 1, 2002. The Texas Dept of Public Safety has been using AMSOIL over 6 years and has saved thousands of dollars in maintenance costs.

Notes: The Super Duty Filters (SDF) are no longer available.  AMSOIL's new Ea Oil filters go 25,000 miles between oil changes and therefore, now only one filter is needed- saving an additional filter($6.90), labor charge ($10.00) and extra quart ($3.90) per vehicle.
Also, know that commercial pricing for AMSOIL is less than dealer pricing.

AMSOIL INC., together with Dealer Jerry Criswell and the Texas Department of Public Safety, conducted a field test of its 5W-30 Synthetic Motor Oil and SDF Oil Filters. Installed in five police fleet vehicles, the lubricant was sampled and tested at various intervals. The goals for this particular field test included demonstrating that the use of AMSOIL Synthetic Motor Oil for extended drain intervals would not only result in lower lubricant expenses, but also superior wear protection.  When taking advantage of the extended drain intervals of AMSOIL Synthetic 5W-30 Motor Oil, it costs the Texas Department of Public Safety $57.20 to lube one vehicle (5 quart capacity) for 24,000 miles:

                               2002 Figures:                                            2007 Figures:
        Oil Cost  ($3.90/qt x 5 qts)    $19.50              Oil Cost  ($4.05/qt x 5 qts)     $20.25                       
        SDF Oil Filters  ($6.90 x 2)     $13.80              Ea Oil Filter ($7.90 ea)            $7.90  
        Oil @ filter change  (one qt)    $ 3.90              No add'l filter change              $0.00                
        Labor ($10.00 x 2)                $20.00              Labor  ($10.00 x 1)               $10.00
                                                  $57.20                                                                        $38.15

If using a conventional 5W-30 lubricant for standard 3000-mile oil and filter drain intervals, it would cost the Texas Department of Public Safety approximately $176 to lube one vehicle (5 quart capacity) for 24,000 miles. For example:

            Oil Cost ($1.75/qt x 40 qts)   $70.00
            Oil Filters ($3.25 x 8)            $26.00
            Labor ($10.00 x 8)               $80.00
                                                    $176.00

Without even taking into consideration the superior protection and performance AMSOIL motor oil offers over a conventional lubricant, the Texas Department of Public Safety saves $118.80 per vehicle in lubricant expenses alone. When extending these savings to all nine vehicles in the Canyon office, AMSOIL motor oil saves the department $1069.20. Taken even further, if all 100 vehicles in the district switched to AMSOIL motor oil and SDF oil filters for drain intervals of 24,000 miles, they would save $11,880. (almost all DPS vehicles throughout Texas now use AMSOIL)

Of course, extended drain intervals are no bargain if they compromise engine protection. Even though it was in service 13 times longer than the previous conventional oil, the rates of wear with AMSOIL Synthetic 5W-30 Motor Oil were significantly lower. The oil analysis results of one test vehicle are shown below, and the results were typical of all five test vehicles. The first line represents the petroleum oil baseline at 1,749 miles. As one can see, the rates of wear with AMSOIL 5W-30 are significantly lower than the petroleum oil, even at extended drain intervals.