A small spend, a very clean win, and the one thing every car-parts advertiser is dealing with in 2025.
The numbers that actually hit the bank account
Ad spend: €26.100
Real revenue (Shopify + server-side): €104.000+
Real ROAS: 4.2x (healthy margins left after ad spend & COGS)
Google Ads dashboard version: only €63k attributed → shows 2.4x. Reason: Consent Mode v2, iOS privacy, ad blockers, delayed conversions. Google is blind to 35–45% of sales right now. Every Shopify car-parts brand I know sees the exact same gap.
What actually moved the needle (car-parts specific):
Mobile dominance: 83% of conversions, car guys research on phone in the garage and order on phone. We leaned in hard: big part photos, clear fitment tables, 1-click checkout, <2-second loads. Mobile became the highest-ROAS device by far.
One Performance Max campaign did 80% of the work NL+BE Pmax → €21k spend, 53k+ conversions, still 4.5x+ real ROAS. Fed it 50+ headlines, every possible part photo + lifestyle shots (cars in action).
Ruthlessly paused underperforming part groups & search terms. Some OEM numbers and long-tail brands ate budget with zero sales. Weekly review → pause anything below 2x ROAS → budget instantly shifted to winners.
The boring weekly routine that keeps CPA low
Value-based smart bidding (once we had clean data)
Negative keyword sweeps (blocked tire/shop comparison crap)
Server-side tracking + enhanced conversions (the only reason we didn’t kill profitable campaigns)
Bottom line: €100k+ revenue from €26k spend is still very possible selling car parts on Google Ads in 2025. Even for small, bootstrapped NL/BE stores. You just have to ignore Google’s half-blind revenue column and optimize for what actually lands in your bank account.
Want the exact campaign structure, asset list, negative-keyword pack and server-side tracking setup that works for car parts right now? Drop your email below, I’ll send the template instantly.