Frequently Asked Questions and Helpful Product Tips

Are there any special storage or handling requirements for DEF (Diesel Exhaust Fluid)?

DEF should be stored out of the weather or in an enclosed building to be protected from the elements and especially contaminants such as dirt and dust.

How can I research information about Ultra Low Sulfur Diesel?

Visit the EPA website, or California Air Resources Board at

Will red dye harm my equipment?

No. Red dye will not harm your tractor or any other diesel-fueled equipment.

Do you pick up old oil drums?

Yes, provided they are completely empty, in good condition, with the 2” and ¾” bungs in place.

How do I get rid of used oil?

By arrangement we can provide this service for our customers if the used oil is placed in a good, clean, used oil drum. Used oil containing anti-freeze or other materials cannot be accepted. If you have an EPA #, call American Valley Waste Oil (800) 732-4645. Small quantities can be disposed with the County Hazardous Materials Division, depending on the quantity. Visit our [link:oil recycling] Oil Recycling page [/link] for more information and helpful links to oil recycling and waste sites in your area.

How much gasoline is lost through evaporation in overhead tanks?

Very little if the tank is painted aluminum or colored white. Dark or black colored tanks will lose more gasoline from evaporation. All tanks will reduce evaporation rates if placed in a shady spot; leaving them in the sun will increase evaporation.

Is branded gasoline better than unbranded?

Branded gasoline normally contains additives from the refinery that improves performance in engines. Unbranded gasoline usually does not include these additives.

How long does gasoline keep before it starts to break down?

Because of the tendency for gasoline to start evaporating its lighter components, loss of quality starts right away. The process is slow and may take over a year before becoming noticeable. Gasoline that has been stored for three years or more should not be used unless mixed with fresh fuel. Gasoline stored long term can cause problems with a vehicle’s fuel system by depositing a varnish that will coat the system, making expensive repairs/cleaning necessary before the engine will run again. Because it is more stable in storage, diesel fuel can be stored for much longer than gas before deterioration occurs.

Is there a difference between different brands of gasoline if the octane ratings are the same?

Many companies use different additives, but the actual performance difference of individual brands, if any, is very slight.

How do I know which octane gasoline to use if I cannot find my owner’s manual?

One way to find out is trial and error. If your car engine “pings” when increasing speed, it is from “pre-ignition” caused by too low an octane. Go to the next octane level. As long as your engine does not “ping” at any time, you are probably using the correct octane. Most engines today are designed to run “Regular” grade of gasoline, unless you have a “high performance” engine. If you’re lacking an owner’s manual, a discussion with a reliable mechanic can be helpful.

What is the difference between “summer” and “winter” grades of gasoline?

The main difference between gasolines made for cold weather use and hot weather use (or winter and summer grades) is higher volatility for winter use and lower volatility for summer use. Cold gasoline vaporizes in the carburetor more slowly, so higher volatility formulations help it vaporize faster. This makes for better engine-starting when the weather is cold. On the other hand, gasoline made for hot weather has a lower volatility rating. This way, it doesn’t vaporize in the fuel system before it reaches the carburetor, causing what is commonly known as “vapor-lock” which stalls the engine until the system is cooled. Government regulations are imposed on refineries, terminals and fuel distributors that mandate when these winter/summer changes are to be made