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Texas Department of Public Safety
Cuts Costs with AMSOIL Synthetic Motor Oil

If using a conventional 5W-30 lubricant for standard 3,000 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:

AMSOIL Cost
Oil Costs
$19.50 ($3.90/qt X 5 qts)
SDF Oil Filters
$13.80 ($6.90 X 2)
Oil @ Filter Change
$  3.90 (one qt)
Labor
$20.00 ($10.00 X 2)
Total
$57.20

View AMSOIL purchase details at the state website.

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 goal 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.

Petroleum Oil Cost
Oil Costs
$  70.00 ($1.75/qt X 40 qts)
Oil Filters
$  26.00 (3.25 X 8)
Labor
$  80.00 ($10.00 X 8)
Total
$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 $1,069.20. 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.

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.

Note: Oil analysis is recommended for all fleet applications to determine proper drain intervals.


Rates of wear (PPM=Parts Per Million)
Miles on oil Iron (Fe)
PPM per mile		 Chromium (Cr)
PPM per mile		 Lead (Pb)
PPM per mile		 Copper (Cu)
PPM per mile		 Aluminum (Al)
PPM per mile		 Silicon (Si)
PPM per mile
1,749 miles
petroleum baseline		 0.010863 0.00114 0.012579 0.005146 0.004574 0.011435
5,325 0.004507 0.00038 0.005258 0.001502 0.00338 0.004507
9,827 0.003053 0.0002 0.001832 0.000916 0.00173 0.002239
12,157 0.002797 0.00016 0.001234 0.000823 0.001481 0.00181
15,259 0.003408 0.0002 0.001376 0.001114 0.001704 0.002228
18,596 0.002527 0.00011 0.000538 0.000645 0.000968 0.001129
22,129 0.001085 0.00009 0.000136 0.000362 0.000497 0.000542
23,572 0.001867 0.00008 0.000339 0.000636 0.000848 0.001061
Physical Properties
Degradation (Percent of the amount allowable)
Miles on oil Viscosity
100 Degrees C		 TBN % OXD % NOX
1,749 miles
petroleum baseline		 9.9 5.5 3.3 11.4
0 11.7 12.3 0.0 0.0
5,325 10.9 8.4 8.9 25.7
9,827 11.8 7.4 15.6 37.1
12,157 12.9 9.3 17.8 42.9
15,259 12.8 9.2 23.3 47.1
18,596 13.5 9.3 26.7 48.6
22,129 14.1 8.6 24.4 47.1
23,572 13.9 9.0 27.8 48.6

View AMSOIL purchase details at the state website.

Go to the Texas DPS Website