You should use an additive in the tank
Try Liqui Moly Super Diesel Additive
for info on where you can purcahse check facebook Liqui Moly Trinidad & Tobago
https://www.facebook.com/pages/Liqui-Mo ... 588?ref=hlSuper Diesel Additive
with Cetan Plus for greater engine performance, less Diesel knocking, quieter running and easier starting. Cleans the engine and injection system and prevents injector needles from seizing or resinifying. Secures the optimum utilisation and energy-conserving combustion of fuels. Reduces corrosion and wear. The plus for super-Diesel fuels. Suitable for low-sulphur Diesel fuels. Tested for compatibility with
turbochargerIntended use
Suitable for all Diesel engines in passenger and commercials vehicles, construction machinery and stationary engines. Outstandingly suitable for preserving engines, even during long periods of non-use under extreme conditions. With long-term effect for 2000 km. When the product is added, the tank must be at least 3 /4 full. 250 ml is sufficient for up to 75 litres of fuel.