Frequently Asked Questions

How can we help?

Choose your product family for answers about selection, treatment and use.

Ordering & Support

Where can I buy locally?

Use our Dealer Locator, then contact the dealer to confirm the exact product and package size are in stock before making a trip. Online availability does not establish local store inventory.

What if an item is missing, incorrect, leaking or damaged?

Check all tracking numbers, because separate boxes can arrive on different days. Contact us with your order number, purchase website and photos of the items and packaging. Keep the packaging available while we review the order and advise the next steps.

Checkout stalled, or I need to change an order. What should I do?

If you are unsure checkout succeeded, check for an order confirmation and contact us before submitting the same order again. For changes or cancellation, contact us promptly with the order number and requested change. We will check the current order status before confirming what is possible.

Where do I find processing, shipping and return details?

Usual order processing is 1–2 business days. We ship with FedEx, UPS and USPS; available services depend on the order and destination. For current service choices, return approval requirements and customer-requested return-shipping responsibility, see our Shipping & Returns policy.

How do I obtain a receipt or verify an order message?

Contact us through the details on our official Contact page with your order number and purchase website. If a text, email or payment link is unexpected, verify it using those independently checked details. Do not send passwords, full payment-card details or security codes by email or text.

How do I ask about a dealer account, bulk order or freight quote?

Start with the Dealer Application or contact our sales team. Include the products, quantities and delivery requirements so we can review the request. Account approval, tax-exemption documentation and freight arrangements must be confirmed for your order.

Still need help? Contact Opti-Lube, email sales@opti-lube.com or call/text 801-491-3717.

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Diesel Fuel Additives

Which diesel additive should I use?

For everyday diesel use, XPD All-Season is our usual all-around recommendation. It combines lubricity, injector cleaning, water separation, corrosion protection, fuel stability, cetane improvement and preventive cold-weather support.

Choose a formula for your main need: XL for a focus on lubricity; Summer+ for warm-weather maintenance; Boost! for a stronger cetane increase; Winter for preventive anti-gel protection; or Single Clean for a one-tank injector-cleaning treatment. If fuel has already gelled, see Gel Melt emergency treatment.

See all diesel additive options or contact us for help choosing a formula.

What is the shelf life of the product?

Unopened diesel maintenance additive stored in good conditions can last up to about 5 years. After opening, we recommend using it within 1–2 years for best results.

Storage conditions matter: keep the container tightly sealed, upright and out of direct sunlight. Temperature, moisture exposure and how much product remains in the container can affect shelf life. This guidance is for the additive itself, not the storage life of treated diesel fuel.

Will using a diesel additive affect my warranty?

Opti-Lube diesel fuel additives are formulated for diesel fuel systems and emissions equipment when used as directed. Use the correct product and dose, and follow your engine manufacturer’s fuel and maintenance requirements.

Warranty coverage is determined under the vehicle or equipment manufacturer’s warranty terms. For a warranty-specific question, check your owner’s manual or contact the manufacturer. We can help with product selection and application questions.

What types of diesel engines can use Opti-Lube?

Our diesel fuel additives are intended for diesel-powered vehicles and equipment, including trucks, older diesels, agricultural machinery and modern diesel fuel systems. Choose a formula suited to your fuel, operating conditions and engine manufacturer’s requirements.

Use only in the fuel or application identified on the product label. Diesel fuel additives go in the diesel fuel tank; do not add them to gasoline, engine oil or a DEF tank unless a product is specifically labeled for that application.

What is the treatment rate? How much do I use?

Treatment rates vary by formula. Follow the current bottle label and the directions for your product and conditions. A treatment rate for XPD does not automatically apply to XL, Summer+, Boost!, Winter, Single Clean or Gel Melt.

For XPD All-Season at 1/4 US fl oz per gallon of diesel, use:

Diesel fuel	XPD additive
5 gallons	1.25 fl oz
10 gallons	2.5 fl oz
20 gallons	5 fl oz
32 gallons	8 fl oz

Measure the fuel quantity you are treating and stay within the labeled treatment range. See XPD product details.

Can Opti-Lube be used with biodiesel or renewable diesel?

Our diesel additives can be used with ULSD, biodiesel blends up to B20 and renewable diesel such as R99, following the directions for the specific formula. Use only fuels approved for your engine.

Cold-weather performance and treatment requirements can vary with fuel composition. For example, Gel Melt’s directions specify a higher dose for biodiesel blends up to B20. Follow the bottle label rather than assuming one dose applies to every fuel.

Can Opti-Lube be used with kerosene?

Yes. Opti-Lube diesel additives can be used with diesel fuel that has been blended with kerosene. Kerosene can reduce lubricity, so adding a lubricity-focused additive such as XL Extreme Lubricant or XPD All-Season can be helpful.

Do Opti-Lube diesel fuel additives contain harmful alcohol, Teflon/PTFE, or solid particles?

No. Opti-Lube diesel fuel additives do not contain harmful alcohols, Teflon/PTFE, solid particles, or anything designed to remain suspended in the fuel that could harm the fuel system.

Some fuel additive ingredients may be alcohol-based for performance reasons, but Opti-Lube diesel additives do not contain harmful alcohols such as methanol or ethanol.

What is cetane, and why increase it?

Cetane relates to how readily diesel fuel ignites during combustion. A higher cetane number can help improve cold starts, reduce ignition delay, smooth engine operation, and support more efficient combustion.

Diesel fuel quality can vary by supplier, region, and season. Winter-blended fuel and some lower-cetane fuels may leave certain engines feeling rougher, louder, harder to start, or less responsive. A cetane-improving additive can help offset those issues.

Can I mix Opti-Lube diesel additives?

Our diesel maintenance formulas are compatible with each other, although each is designed to be used on its own. Some customers combine XL with Boost! to focus on lubricity and cetane improvement.

Follow each product’s directions. Do not assume that combining two products means you can double the dose or add their advertised benefits together. Contact us for help choosing a combination and treatment rate. Follow the separate label directions for emergency treatments such as Gel Melt.

How should I add the product to my fuel?

For routine tank treatment, measure the recommended amount and add it directly to the diesel fuel tank before or during fueling. The incoming fuel and normal movement in the tank help mix the additive.

Follow the specific product directions. Preventive anti-gel products must be mixed into liquid fuel before it reaches its cloud point. Gel Melt has separate emergency tank and filter instructions; follow those directions and your equipment’s service instructions.

Does it do anything besides reduce wear and friction?

Benefits depend on the formula. Our maintenance additives can provide injector cleaning, corrosion protection, water separation and improved fuel stability. Cetane improvement and preventive anti-gel protection are included in selected formulas.

Special-purpose products have different jobs: Single Clean is for a one-tank cleanup, Preserve is for stored diesel, and Gel Melt is for cold-weather emergencies. Compare the product details for the benefits you need. Fuel-economy results vary with fuel quality, engine condition, driving and operating conditions.

Can I mix Opti-Lube with a competitor's product?

We recommend using Opti-Lube products as directed rather than combining them with another brand. We cannot confirm the compatibility, treatment rate or combined performance of every competing formula.

If your fuel already contains another aftermarket additive, contact us with the product name, amount used and fuel quantity before adding more.

How do XPD, XL, Summer+, Boost!, Winter, Single Clean and Gel Melt differ?

XPD All-Season: All-around maintenance with lubricity, cleaning, cetane improvement and preventive cold-weather support.
XL Xtreme Lubricant: A focus on lubricity and fuel-system maintenance; choose a preventive anti-gel formula when needed for cold weather.
Summer+: Warm-weather maintenance with lubricity, cleaning and cetane improvement.
Boost!: A focus on a stronger cetane increase.
Winter: Preventive anti-gel protection; add while the fuel is still liquid.
Single Clean: A one-tank fuel-system and injector-cleaning treatment.
Gel Melt: Emergency treatment for gelled fuel or frozen filters; not for continuous use.

See diesel additive options and follow the directions for your chosen formula.

Should I use XPD All-Season if I do not need anti-gel protection?

Yes. XPD All-Season is not just an anti-gel product. In warm climates, customers still use it for lubricity, injector cleanliness, water separation, corrosion protection, fuel stability, and overall fuel quality. The anti-gel portion simply adds extra protection if temperatures drop.

Should I choose XL Xtreme Lubricant or XPD All-Season?

Choose XPD All-Season for all-around maintenance with lubricity, injector cleaning, cetane improvement, water separation, corrosion protection, fuel stability and preventive cold-weather support.

Choose XL Xtreme Lubricant when lubricity is your main priority and you do not need an anti-gel formula. Both can be used for regular diesel maintenance. For cold-weather prevention, choose XPD or Winter as appropriate and add it before the fuel reaches its cloud point.

Can I use more than the recommended amount?

Stay within the treatment range on your bottle or product page. Using significantly more than directed does not automatically improve performance and can waste product.

Some labels specify a different rate for certain conditions, such as Gel Melt treatment of biodiesel blends. Use those product-specific directions. For injector-cleaning concerns, consider the labeled Single Clean treatment rather than heavily overdosing a maintenance formula. If you added much more than directed, contact us with the product, amount and fuel quantity.

Do I use Single Clean instead of my regular additive?

Single Clean is designed for a one-tank cleanup of diesel fuel-system and injector deposits. One 8 fl oz bottle treats up to 32 gallons of ULSD; follow the bottle label.

After the cleaning treatment, return to your usual maintenance additive, such as XPD All-Season, XL or Summer+. Single Clean does not replace preventive anti-gel protection when cold conditions require it.

Can I use diesel additives with modern emissions systems and DEF-equipped vehicles?

Our diesel maintenance additives are formulated for ULSD and are compatible with modern diesel fuel systems and emissions equipment when used as directed, including vehicles with diesel particulate filters (DPF), exhaust gas recirculation (EGR) and selective catalytic reduction (SCR).

Add diesel fuel additive to the diesel fuel tank only. Never add fuel additive to the diesel exhaust fluid (DEF/AdBlue) tank. Vehicles that use DEF still need the correct DEF in their separate DEF system.

Fuel additives do not replace required emissions-system service or guarantee a particular regeneration frequency. Follow your engine manufacturer’s fuel and maintenance requirements.

Will a 2-micron fuel filter remove the additive?

No. Opti-Lube fuel additives dissolve into the diesel fuel. They are not solid particles, so a normal fuel filter, including fine filtration systems, will not filter the additive out of the fuel.

My additive looks cloudy or has white particles. Is it still okay to use?

Cold exposure can temporarily make some diesel maintenance additives cloudy or cause components to crystallize. This can be reversible and does not necessarily mean the product has expired.

For these formulas, warm the sealed bottle in a 90–110°F warm-water bath for 20–30 minutes, then shake well. Once the product returns to its normal appearance, use it as directed. Do not use an open flame, microwave or direct heat source.

If particles remain, the appearance does not return to normal, or you suspect water or other contamination, contact us before use. Have the product name and a photo available. Follow the label and Safety Data Sheet for the specific formula.

How should I store Opti-Lube additives?

Keep containers tightly sealed, upright, in a cool, dry location and out of direct sunlight. Avoid prolonged exposure to extreme heat or freezing temperatures. Follow the product label and Safety Data Sheet.

If a diesel maintenance additive becomes cloudy or forms crystals after cold exposure, see the warming guidance above. Contact us if it does not return to its normal appearance or you suspect contamination.

When should I add anti-gel?

Add a preventive anti-gel such as Winter or XPD while the diesel is still liquid and before it reaches its cloud point—the temperature where wax crystals begin to appear. Adding it before or during fueling helps it mix into the fuel.

Cold-weather results depend on the base fuel, treatment rate and conditions. Preventive anti-gel is not a thawing treatment. If fuel has already gelled or a filter has frozen, follow Gel Melt’s emergency directions and your equipment manufacturer’s service and priming instructions.

Can Opti-Lube help with black smoke or rough running?

It may help if the issue is related to fuel quality, cetane, or injector deposits. Single Clean is the best choice for a stronger cleaning treatment, while XPD All-Season, XL Extreme Lubricant, and Summer+ are better suited for regular maintenance. If the issue is mechanical, tuning-related, air-related, or emissions-system related, an additive may not correct the problem.

Gasoline Additives

Will using Gas Enhance affect my warranty?

Gas Enhance is formulated for gasoline fuel systems and emissions equipment when used as directed. Use the labeled dose and follow your engine manufacturer’s fuel and maintenance requirements.

Warranty coverage depends on the vehicle or equipment manufacturer’s warranty terms. Check your owner’s manual or contact the manufacturer for a warranty-specific question. Contact us for Gas Enhance application help.

What types of gasoline engines can use Gas Enhance?

Gas Enhance is intended for gasoline-powered vehicles and equipment, including carbureted, port-injected and direct-injected fuel systems. It can be used in suitable large and small gasoline engines when the label and engine manufacturer’s requirements are followed.

Use Gas Enhance in the gasoline fuel tank at its labeled rate. Choose a diesel additive for diesel fuel and follow separate instructions for oil additives. If you are unsure about a particular application, contact us with the engine and fuel type.

How much Gas Enhance should I use?

Follow the treatment rate on the current Gas Enhance bottle and product page. The dose depends on the product and amount of gasoline being treated.

Use fluid ounces for additive volume and gallons for fuel volume. Diesel additive treatment rates do not apply to Gas Enhance. Contact us if a bottle label and online direction appear to disagree.

How do I add Gas Enhance to gasoline?

Measure the labeled Gas Enhance dose and add it directly to the gasoline fuel tank, preferably before or during fueling. Incoming fuel and normal fuel movement help mix it.

Use only in the application stated on the label. Do not add gasoline fuel additive to the engine oil or a DEF tank.

Does Gas Enhance contain PEA?

No. Gas Enhance does not contain PEA. It uses a PIBA-based detergent package designed for regular use to help keep gasoline fuel systems clean.

No. StictionRX targets deposit-related sticking and friction; symptoms can also have mechanical or electrical causes. Persistent problems need diagnosis. An additive does not repair a failed component or replace the prescribed oil grade, filter changes or service interval.

Follow the separate directions for each product and review its Safety Data Sheet