How Karparts Scaled Walmart Connect Advertising Across an 800K+ SKU Catalog

Karparts is a high-volume automotive parts seller on Walmart, managing one of the largest and most complex catalogs in the category with more than 800,000 SKUs. The assortment includes fitment-specific replacement parts and exterior components such as mirrors, headlights, tail lights, and other vehicle-dependent products where accuracy by year, make, and model is critical.

The business continuously expands its catalog, regularly onboarding large batches of new SKUs. This level of scale creates a unique challenge: advertising must keep pace with growth without becoming inefficient or unmanageable.

The Challenge

Karparts needed to advertise at a scale that most accounts never reach. Tens of thousands of new SKUs were added at a time, and advertising coverage needed to follow immediately. Manual campaign builds simply could not keep up.

At the same time, not every product in the catalog was equally ready to convert. Listing quality varied, some items lacked reviews, and others required pricing or attribute updates before advertising could perform efficiently. Without the right structure, scaling advertising risked spreading spend too thin and eroding profitability.

The goal was clear: support continuous catalog growth while keeping advertising efficient and under control.

Why Quartile

Karparts needed a partner that could handle scale without adding complexity. The team wasn’t looking for more hands-on management or constant manual intervention. They needed a system that could launch consistently, learn quickly, and stay efficient as the catalog grew.

Quartile was chosen for its ability to combine automation with discipline—providing broad coverage across a massive catalog while keeping performance focused on what actually converted.

The Solution

Quartile built a standardized, automated campaign approach designed to keep advertising coverage broad and consistent as new SKUs were added. This made it possible to activate large SKU sets quickly without rebuilding campaigns from scratch each time.

Rather than pushing every new product aggressively, campaigns were given time to gather performance signals before spend was concentrated. This kept inefficient SKUs from absorbing budget and allowed stronger products to naturally take priority.

Quartile also worked closely with the Karparts team to address retail readiness issues. When products weren’t eligible or positioned to convert, those gaps were resolved so advertising investment translated into results instead of wasted spend.

As the year progressed, additional automation was introduced to speed up campaign creation even further, helping Karparts move faster from SKU launch to active promotion without losing control.

Results & Impact

Karparts’ Walmart Connect advertising program is built to scale alongside its catalog without sacrificing efficiency.

• TACoS improved by 73% while still supporting higher volume

• ROAS increased by 175%, reflecting stronger efficiency and better allocation of spend

• Advertising performance remained stable across an 800K+ SKU catalog, even as new products continued to launch

The result was a sustainable advertising foundation—one that supported growth and removed operational strain from managing advertising at extreme scale.

Future State

Today, Karparts operates with an advertising system built for ongoing expansion. New SKUs can be launched quickly, performance remains controlled, and efficiency holds as the catalog continues to grow.

Quartile continues to support optimization and scale, ensuring Karparts can keep expanding without adding complexity or sacrificing results.

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