Request and receive generator fuel testing consultation for FREE!

Fill out the form below and an OSCO representative will contact you to schedule your consultation




Limited to the first 10 requests

Did you know that diesel fuel begins to deteriorate and form solids within 60-90 days after refining?

Deposits inevitably accumulate as sludge in tanks, filtration and other fuel system components. Over a short period, these particulates can cause failure and damage to your generator requiring expensive repair, maintenance or replacement.

Osco Oil samples and tests fuel for ASTM specification; and for a limited time we are waving our $75 sampling fee. Our sampling consultation starts with a sample being pulled and a visual inspection of the sample, where Osco looks for water, sediment and color.

Osco Oil will provide samples and findings stating the quality of your sample with a detailed explanation of the test results as well as recommendations for net steps.

Read Below for a detailed description of our testing protocol:

There is always some water in all fuel tanks due to moisture in the air creating condensation on the tank walls. Moisture beads up on the walls of the tank as the outside temperature changes from day to night. As the condensation forms on the tank it will run down the walls and build up on the bottom of the tank. Depending on how much water is in the sample, Osco recommends steps for its removal. Most samples have a small amount of water that can be dealt with through additives. If there are large amounts of water in the sampler technician might recommend pumping the water off the bottom of the tank, treating the tank with water dispensing additive and biocide, which kills bacteria. The biocide should be added again in six months and treatment should continue for a year.

Sediment in a tank can be rust, small rocks, dirt, floating particles from the diesel breaking down or a bacteria growth in the diesel. The sediments that need to be dealt with immediately are particles and bacteria. Floating particles indicate that the fuel is breaking down and will continue to breakdown creating more floating particles. The best step to take with this issue is to remove the diesel from the tank and replace the fuel. Bacteria present in the tank indicates the presence of outside water in the tank. Our first step is to treat the tank with a biocide and after 48 hours pump out all water and sediment from the bottom of the tank. Bacteria can still be present in the tank by leaching itself into the tank walls or it may not be killed by the first treatment of biocide. A sample should be taken a week after these steps were taken. If the bacteria is still present a second treatment will be required or the tank may need to be pressure washed. The first steps should be repeated until a clean sample is pulled.

The color of the diesel is the best indicator of age and the likelihood of the diesel breaking down. Pink diesel indicates new product. Reddish in color indicates the beginning of aging. Brown means it is close to breaking down. If the product is dark brown it will still create the energy required to run the generator, but it is best to run the generator down to below 75% before adding new diesel or removing and replacing the fuel.

Osco Oil will provide samples and findings stating the quality of sample or an explanation of the test results. Let me know when you need to a sample?