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  3. ULTRA 1PLUS UL703

ULTRA 1PLUS UL703 Synthetic Slip Gear Oil Api 75W-90 GL-5 MT-01

Mt-01 Ultra 1plus Ul703 Sae 75w-90 Synthetic Limited Slip Gear Oil Api Gl-5 Qt

( Brand: Ultra 1plus ), ( Manufacturer Part Number: UL703 ), ( Product: Machine Lubricant ), ( Compatible Model: Please Reach Out To Seller To Confirm Compatibilit ), ( Recommendedusesforproduct: Hypoid Gear Differentials ), ( Specificusesforproduct: Automotive Differentials, Manual Transmissions ), ( Includedcomponents: Gear Oil ), ( Material: Synthetic ), ( Size: 1 Qt ), ( Item Weight: 2.09 Lbs )

Review ULTRA 1PLUS Sae 75w-90 Synthetic Limited Slip Gear Oil Api Gl-5 Qt

The **Ultra 1Plus UL703 75W-90 Synthetic Slip Gear Oil** is a high-performance, full-synthetic lubricant engineered to deliver exceptional protection and longevity for heavy-duty transmissions, differentials, and slip yokes in demanding applications. Formulated with a cutting-edge blend of advanced synthetic base stocks and a premium additive package, this API GL-5 and MT-1 compliant oil excels in extreme operating conditions, ensuring superior wear resistance, thermal stability, and oxidation resistance. Its superior viscosity index and low-temperature fluidity make it ideal for both high-speed and high-torque applications, from performance vehicles and off-road trucks to heavy-duty towing and racing setups. The oil s slippery synthetic formulation minimizes internal friction, reducing heat buildup and energy loss while enhancing gear engagement and overall drivetrain efficiency. Whether used in manual transmissions, limited-slip differentials, or specialized slip yokes, the UL703 provides robust protection against gear pitting, scoring, and premature wear, even under severe loads and high temperatures. Its long-lasting performance and resistance to breakdown make it a trusted choice for enthusiasts and professionals seeking maximum durability and reliability in their drivetrain systems.

### **Pros and Cons of Buying Ultra 1 PLUS UL703 (75W-90 Synthetic Slip Gear Oil, API GL-5, MT-01)**

#### **Pros:**

1. **High-Quality Synthetic Base Stock** Ultra 1 PLUS is formulated with advanced synthetic technology, providing superior thermal and oxidative stability compared to conventional mineral oils. This results in better protection against wear, heat, and sludge buildup, especially in extreme operating conditions.

2. **API GL-5 Certification** This oil meets the stringent requirements of the American Petroleum Institute s GL-5 specification, making it suitable for heavy-duty applications such as manual transmissions, transfer cases, and rear axles in trucks, SUVs, and performance vehicles. It is designed to handle the high stress and extreme pressures found in spiral-bevel and hypoid gears.

3. **MT-01 Compatibility** The oil is also approved for MT-1 (Military Specification) applications, which means it is trusted for use in military vehicles and other demanding off-road or high-performance scenarios. This certification ensures reliability in harsh environments.

4. **Excellent Wear Protection** The synthetic formulation includes additives that reduce friction and prevent metal-to-metal contact, extending the lifespan of gears and transmission components. This is particularly beneficial for vehicles subjected to heavy loads or frequent towing.

5. **Resistance to Foaming and Aeration** Synthetic oils like Ultra 1 PLUS are less prone to foaming, which helps maintain consistent lubrication even under high-speed or high-temperature conditions. This reduces the risk of transmission failure or gear damage.

6. **Longer Drain Intervals** Due to its stability and resistance to breakdown, this oil can often last longer between changes compared to conventional oils, reducing maintenance costs and downtime.

7. **Compatibility with Modern and Older Vehicles** While primarily designed for heavy-duty applications, its robust formulation also works well in a variety of older and newer vehicles that require GL-5 or MT-01 specifications, making it a versatile choice.

8. **Brand Reputation** Ultra 1 is a well-known brand associated with high-performance lubricants, often preferred by mechanics and enthusiasts for its reliability and performance in extreme conditions.

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#### **Cons:**

1. **Higher Cost** Synthetic oils, especially those with advanced certifications like GL-5 and MT-01, are typically more expensive than conventional mineral oils. This can be a significant factor for budget-conscious buyers, especially for frequent top-ups or full changes.

2. **Potential for Incompatibility with Some Vehicles** While this oil is suitable for heavy-duty and performance applications, it is **not recommended** for vehicles with automatic transmissions, CVTs, or front-wheel-drive systems that require GL-4 or lower viscosity oils. Using GL-5 oil in these systems can cause premature wear or damage to seals and synchronizers. Always check the vehicle s manual or manufacturer recommendations before use.

3. **Limited Availability** Depending on your location, Ultra 1 PLUS may not be as widely available as more common brands like Mobil 1, Pennzoil, or Castrol. This could make purchasing or finding a replacement more difficult in some regions.

4. **Potential for Overkill in Light-Duty Applications** For everyday passenger cars or light trucks that do not require GL-5 oil, this product may be unnecessarily aggressive. The higher friction modifiers in GL-5 oil can wear out softer materials in some transmissions over time if not specified.

5. **Environmental Considerations** While synthetic oils are generally more stable and less harmful to the environment than conventional oils, they are still petroleum-based and require proper disposal. Improper disposal can have negative environmental impacts.

6. **Risk of Overfilling or Incorrect Usage** Like any high-performance oil, Ultra 1 PLUS must be used correctly. Overfilling or mixing with incompatible oils (e.g., GL-4 or automatic transmission fluids) can lead to poor performance or damage. Always follow the manufacturer s guidelines for fill levels and compatibility.

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### **Conclusion:**

Ultra 1 PLUS UL703 (75W-90 Synthetic Slip Gear Oil, API GL-5, MT-01) is an excellent choice for heavy-duty vehicles, manual transmissions, transfer cases, and off-road applications where extreme durability and protection are required. Its synthetic formulation, GL-5 certification, and MT-01 approval make it one of the most reliable options for high-stress environments. However, its higher cost and potential incompatibility with certain vehicles (particularly those with automatic transmissions or front-wheel drive) must be carefully considered before purchase.

If you are working on a **heavy-duty truck, SUV, or performance vehicle with a manual transmission or rear axle that specifies GL-5 oil**, this product is highly recommended. For **light-duty cars, automatic transmissions, or vehicles requiring GL-4 or lower viscosity oils**, it is not suitable and could cause damage.

### **Recommendation:**

- **Buy it if:** You need a high-performance, long-lasting gear oil for manual transmissions, transfer cases, or off-road vehicles that require GL-5 or MT-01 specifications.

- **Avoid it if:** Your vehicle has an automatic transmission, CVT, or front-wheel drive system that requires a different oil specification (e.g., GL-4, MT-1, or automatic transmission fluid).

- **Alternative options:** If you need a more budget-friendly or versatile option, consider other synthetic gear oils like **Mobil 1 Synthetic Motor Oil (for manual transmissions in some cases)**, **Pennzoil Synthetic Gear Oil (GL-5)**, or **Castrol Syntrans Transaxle Oil (for manual transmissions in some vehicles)**. Always cross-reference with your vehicle s manual to ensure compatibility.

Details:

ENHANCED PERFORMANCE IN DIFFERENTIALS: Engineered with specific limited-slip LS additives, it eradicates chatter, ensuring seamless functionality in differentials for smoother, efficient operation. MAXIMUM GEAR PROTECTION: Extreme pressure anti-wear additives safeguard gear teeth from shock loading and high torque, ensuring prolonged life reduced maintenance needs. ALL-WEATHER RELIABILITY: U1P 75W90 Synthetic Gear Oil guarantees excellent cold temperature flow, ensuring reliable operation in diverse weather conditions. COST-EFFECTIVE MAINTENANCE SOLUTION: Exceeding performance benchmarks, it minimizes maintenance costs and extends equipment lifespan, providing a cost-efficient solution for diverse applications.

part #: ul703 prices

  • $56.59-$66.50

specifications automobilefluids:

  • brand: Ultra 1plus
  • mpn: Ul703
  • product: Machine Lubricant
  • compatible model: Please Reach Out To Seller To Confirm Compatibilit
  • recommendedusesforproduct: Hypoid Gear Differentials
  • specificusesforproduct: Automotive Differentials, Manual Transmissions
  • includedcomponents: Gear Oil
  • material: Synthetic
  • size: 1 Qt
  • item weight: 2.09 Lbs

payments automobilefluids:

  • other
  • wallet: Apple-pay
  • credit card: Visa

seller automobilefluids:

  • city: Ho-Ho-Kus, New Jersey
  • rating: 99.6%
  • # reviews: 11642

shipping automobilefluids:

  • class: Standard
  • cost: $0.00
  • service: Standard
  • transit: 5-9 Days
  • type: Fixed

offer automobilefluids:

  • sold: 0
  • options: Ship-to-home
  • availability: In Stock
  • started: February 14, 2026
  • quantity: 3

returns automobilefluids:

  • paid by: Seller
  • time: 30 Days
  • policy: Returns Accepted

general automobilefluids:

  • condition: New
  • Automotive Tools Supplies > Fluids Chemicals > Gear/Differential Oil
product: machine lubricant, compatible model: please reach out to seller to confirm compatibilit, recommendedusesforproduct: hypoid gear differentials, specificusesforproduct: automotive differentials, manual transmissions, includedcomponents: gear oil, size: 1 qt, item weight: 2.09 lbs,
category: auto parts > tools supplies > fluids chemicals > gear/differential oil, material: synthetic, sku: 11531110969950881,
Ultra 1plus UL703 Is Similar To:
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2 offers $56.59–$66.50 USD
  • New. Offer #1 priced at $56.59 + $0.00 shipping estimate = $56.59* total. Industrial Fluids. Ultra1Plus 75W-90 API GL-5 Gear Plus Synthetic Oil highlights U1P-Gear SAE 75W-90 Synthetic Limited Slip Gear Oil, API GL-5, (6 QTS).FREE SHIPPING
  • New. Offer #2 priced at $66.50 + $0.00 shipping estimate = $66.50* total. Date First Available : May 5, 2020. ULTRA 1PLUS SAE 75W-90 Synthetic Gear Oil API GL-5 - Transmission and Differential Fluid (6 QTS).FREE SHIPPING

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