Financial research concept

Auto Dealer Parts and Service Gross Margin

measures gross profit from service, parts, warranty, and related fixed operations as a share of their revenue, exposing a higher-margin profit pool than vehicle retailing.

By Lee BaileyPublished Sep 28, 2026

Research context

See what supports this page, how current it is, and where comparable or historical context is available.

Research date: Sep 28, 2026Use the dated article and cited sources for the definition, examples, and stated limitations.
Operating-model context: 10 connected conceptsPart of the reviewed Automotive Dealership Economics; issuer definitions remain distinct where disclosed.
Company examples: 3 reviewed companiesRelationships reflect supported examples, not a normalized cross-company KPI ranking.

Fixed operations can carry the profit pool
Mix inside service matters
Part of the Automotive Dealership Economics
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Auto dealer parts and service gross margin is gross profit from dealership service, parts, warranty, collision, and related fixed operations divided by the corresponding revenue.

The line is economically different from selling a vehicle. AutoNation's 2025 parts-and-service gross margin was 48.7%. Penske reported a 58.7% same-store service-and-parts gross margin for its retail automotive dealerships, while Sonic reported 51.0% in franchised fixed operations.

Fixed operations can carry the profit pool

AutoNation generated only 17.5% of 2025 revenue from parts and service but 47.6% of gross profit from that business. That is why a dealer's gross profit mix can look radically different from its revenue mix.

Service demand also has a different cadence from vehicle sales. Repair orders, technician capacity, warranty work, collision activity, labor rates, and the installed base of vehicles can support gross profit even when new-car front-end margins weaken.

Mix inside service matters

"Parts and service" is not one homogeneous product. Penske attributed its 2025 same-store margin improvement partly to changes in warranty and customer-pay mix and a higher effective labor rate. Sonic also cited warranty contribution and customer-pay margin in its fixed-operations performance.

So a higher margin does not automatically mean every repair became more profitable. Investors should look at customer pay, warranty, wholesale parts, collision, technician capacity, and pricing where the issuer discloses them.

The broader dealership model links this recurring profit pool with F&I gross profit per retail unit, another back-end source of gross profit attached to the vehicle customer relationship.

Primary sources: AutoNation 2025 Form 10-K, Penske Automotive Group 2025 Form 10-K, and Sonic Automotive 2025 Form 10-K.

Part of the Automotive Dealership Economics

Connect same-store normalization, vehicle transaction value and front-end gross profit, back-end F&I and fixed operations, inventory pressure, profit mix, and overhead conversion across franchised automotive retailers.

Browse the full operating model in Company Analysis →

Where this concept fits

Back-end gross profit and dealership profit mixCurrent relationship
F&I monetizes financing and attached protection products per retail sale, while parts and service earns a higher-margin recurring gross-profit stream. Gross-profit mix shows how those businesses can contribute far more profit than their revenue share implies.
F&I Gross Profit per Unit Dealer Gross Profit MixParts & Service Gross MarginCurrent concept
Same-store vehicle transaction and front-end economics
Same-store cohort rules separate organic operations from portfolio changes. New and used revenue per retail unit show transaction value, while the corresponding gross-profit PVR measures show the front-end spread retained from those sales.
New-Vehicle Gross Profit per Unit New-Vehicle Revenue per Unit Dealer Same-Store Basis Used-Vehicle Gross Profit per Unit Used-Vehicle Revenue per Unit
Inventory pressure and operating leverage
Vehicle inventory days provide context for availability, aging, and pricing pressure, while SG&A as a percentage of gross profit shows how the resulting dealership gross-profit pool converts through overhead.
Inventory Days Supply Dealer SG&A / Gross Profit

F&I Gross Profit per Unit
Dealer Gross Profit Mix
Inventory Days Supply
New-Vehicle Gross Profit per Unit
New-Vehicle Revenue per Unit
Parts & Service Gross MarginCurrent concept
Dealer Same-Store Basis
Dealer SG&A / Gross Profit
Used-Vehicle Gross Profit per Unit
Used-Vehicle Revenue per Unit

See It in Company Research

These companies are examples of how the concept is reported or discussed in public filings. Definitions can differ by issuer; these links open company research rather than a normalized metric comparison.

ANOpen operating-model research →10 of 10 reviewed concepts in Automotive Dealership EconomicsBack-end gross profit and dealership profit mix3 of 3 bridge concepts supportedContinue through this bridge:Dealer Gross Profit Mix F&I Gross Profit per Unit
PAGOpen operating-model research →8 of 10 reviewed concepts in Automotive Dealership EconomicsBack-end gross profit and dealership profit mix2 of 3 bridge concepts supportedContinue through this bridge:F&I Gross Profit per Unit
SAHOpen operating-model research →6 of 10 reviewed concepts in Automotive Dealership EconomicsBack-end gross profit and dealership profit mix2 of 3 bridge concepts supportedContinue through this bridge:F&I Gross Profit per Unit

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Compare fixed-operations margins

Compare service and parts profitability with attention to customer-pay, warranty, collision, labor-rate, and repair-order mix.

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