What's in Long Island Heating Oil? Ultra-Low Sulfur and Bioheat B10

From the Alcus family · Alcus Fuel Oil & Sons, Amityville · Updated October 31, 2026

The heating oil going into Long Island tanks today isn't the oil of 20 years ago. Here's what's in it, why, and what it means for you.

What we deliver

We deliver No. 2 ultra-low sulfur heating oil, Bioheat B10: 90% ultra-low sulfur heating oil and 10% biodiesel, dyed red as required for heating fuel. It's the same grade used across Nassau and Suffolk.

Ultra-low sulfur (ULS)

New York requires heating oil to be ultra-low sulfur, no more than 15 parts per million. Older heating oil had hundreds or thousands of ppm. Less sulfur means less soot and scale building up in the boiler and chimney, and cleaner exhaust. You still need a yearly tune-up, but a clean-burning fuel helps the burner stay efficient between cleanings.

Bioheat and the New York biodiesel law

• Nassau and Suffolk heating oil has had to include biodiesel for years.
• Since July 1, 2025: at least 10% biodiesel (B10).
• 2030: at least 20% (B20).

Biodiesel is made from renewable sources such as used cooking oil and soybean oil. Blended into heating oil, it cuts carbon emissions compared with straight petroleum oil.

Does it change anything for your system?

• No conversion needed. B10 runs in standard oil burners and tanks.
• Keep up with maintenance. Biodiesel can loosen old sludge in older tanks, which is one more reason to change the oil filter at your yearly tune-up.
• Avoid water in the tank. Keep the fill and vent caps tight. If you suspect water, or your tank is old and rusty, see oil tank replacement.
• Price. Blends are reflected in the per-gallon price you see on today's prices.

Questions