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Open a new account and we will treat your first fuel order* with BioGuard Plus 6!

Fill out the form below and an OSCO representative will contact you to process your order

Limited Time Offer - Up to 750 Gallons


Diesel 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.

Be proactive and make sure your generator is ready to go when you need it most. Get it filled up or topped off, and we’ll treat your fuel with ValvTect BioGuard Plus 6™, for free!*

For more information about how OSCO OIL can keep your Generator running smoothly, click here.

BioGuard Plus 6 is the only EPA registered fuel micro-biocide that improves diesel fuel quality, prevents biological contamination and improves the performance of heavy-duty diesel engines. You won’t have to worry about unstable fuel, rust, corrosion, soot, smoke, odor, plugged filters or worn fuel pumps and injectors. Instead, you can have peace of mind and a smooth running engine.

Osco Oil uses ValvTect BioGuard Plus 6™ to treat diesel fuel and keep heavy-duty diesel engines performing at their best.

We trust BioGuard Plus 6 because it’s the only EPA registered fuel micro-biocide that improves diesel fuel quality, prevents biological contamination and improves engine performance. Here are the specifics:

BioGuard Plus 6™ contains a diesel fuel stabilizer to prevent formation of particulates and sludge that plug fuel filters and injectors.

BioGuard Plus 6™ contains a rust and corrosion inhibitor to protect fuel tanks and the entire fuel system.

BioGuard Plus 6™ contains VT 101™ lubricity improver to not only prevent premature wear, but also extend fuel pump and fuel injector life.

BioGuard plus 6™ contains a moisture dispersant to hold moisture in suspension and prevent it from dropping out which can cause sludge, filter plugging and corrosion.

BioGuard Plus 6™ contains Diesel Guard Supreme detergent to prevent and clean up existing deposits. Clean fuel injectors will start engines more easily, improve engine power output and can improve fuel economy up to 6%.

BioGuard Plus 6™ contains a cetane improver to provide more complete combustion. This also means a smoother running, better performing engine with reduced exhaust emissions and improved cold temperature starting.

BioGuard Plus 6 is a trademark of ValvTect Petroleum Products