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Williams Jet Tenders installs a tank of HVO, hydrotreated vegetable oil

The new fuel cuts net CO2 emissions by up to 97% and can be used on all nine diesel models in the Williams range powered by Yanmar 4LV engines.

di Joseph Orrù
2 May 2025
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Williams Jet Tenders

Williams Jet Tenders has taken a significant step forward in its sustainability journey by installing a 6-liter tank of hydrotreated vegetable oil (HVO) at its Oxfordshire headquarters. The new tank will power the company's entire fleet of vehicles and all diesel-powered models. With HVO approved for use in Yanmar 4LV engines, all nine diesel models in the Williams range—DieselJet 415, 445, 505, 565, and 625, SOLAS 505, 565, and 625, and EvoJet 70—are now fully compatible with this renewable fuel.

HVO is a low-carbon fuel that reduces net CO2 emissions by up to 97% compared to standard diesel. Williams is working closely with its partners to better understand its overall environmental impact.

“This initiative further demonstrates our commitment to reducing our environmental footprint,” said Dan Bloice-Smith, Director of Operations and Sustainability at Williams Jet Tenders. “The approval of HVO for our large diesel models, which use Yanmar 4LV engines, is another important step forward. Our engine partner, Yanmar Marine International, has been an excellent partner in this transition, and we share a vision of creating a brighter future for our planet.”

"At Yanmar Marine, we are committed to driving innovation in sustainable marine propulsion," said Floris Lettinga, Director of Sales and Marketing at Yanmar Marine International. "The approval of hydrotreated vegetable oil for our Yanmar 4LV engines marks a significant step toward reducing emissions in the industry. We are pleased to see Williams Jet Tenders take a proactive approach by installing their own HVO tank and pioneering environmentally sustainable solutions. This initiative aligns perfectly with our vision of providing high-performance, environmentally responsible power solutions for the marine industry."

One of the most high-profile alternative fuels available today, HVO—also known as renewable diesel—offers a seamless transition from fossil diesel without the need for modifications for Yanmar Marine engines. Only engines with older serial numbers require a fuel filter adaptation. HVO complies with the European standard EN15940, has excellent oxidation stability, and is resistant to bacterial growth. It is derived from renewable waste materials such as used cooking oil, tall oil by-products (a waste product from wood pulp processing), non-edible vegetable oils, and residual fat fractions.

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