A focused postcard plus phone-follow-up playbook designed for one job: bringing your past customers back when they're due.
Start Free — No Credit CardMost service drift isn't competitive — it's procrastination. Your customer hits 5,000 miles past their last oil change and the dashboard light starts feeling normal. The shop that mails the reminder gets the visit.
2 waves over 5 weeks, then back into the rotation. Below is exactly what mails when, and why.
Headline: "You're due for your [service]" · Offer: $X off + free multi-point inspection · QR to online booking.
Personal, mileage-specific copy: "It's been 6 months since your last oil change — time to keep your engine running smooth." The follow-up call lands 7–10 days later: "Wanted to make sure you got our reminder — can we get you on the schedule this week?" About 70% of total visits come from this wave.
Headline: "Before the heat hits" or "Before the cold snap" · Offer: Free seasonal check (AC, battery, brakes).
Mailed only to non-responders, 35 days after Wave 1. Different angle: seasonal hook. AC service before summer, battery test before winter, brake check before the rainy season. The seasonal frame gives you a fresh reason to reach out without feeling repetitive.
All wave timing, call scripts, and copy direction are pre-configured for service reminder campaigns. You only customize the offer (10% off, $25 off, free inspection) and your shop branding.
Export past customers from Mitchell 1, Shop-Ware, AutoLeap, Tekmetric, or any shop management software as CSV. Filter by last visit date older than 90 days. Our import wizard auto-maps name, address, phone, and last service columns.
Wave 1 postcards print and drop into USPS within 1–2 business days. Your call queue populates 7 days after delivery. Wave 2 schedules itself 35 days later, only mailing to non-responders.
Each call has a pre-loaded script. Front desk logs the outcome (booked, voicemail, declined). Booked customers drop out of the sequence automatically and re-enter on their next service interval.
Most independent shops have 800–1,500 past customers in the last 18 months. Here's the math on a 1,000-customer run through this exact playbook:
12.7:1 ROI — before any upsell to brakes, tires, or 60K service work.
Run your own numbers in the ROI calculator.
Free to explore — you only pay when you're ready to send. 30-day money-back guarantee.
Single-wave postcard campaigns · Unlimited contacts · From $1.05/piece
Everything in Free + calls, sequencing · From $0.79/piece
Per-piece pricing includes printing + USPS First-Class postage. No hidden fees.
Drop in your shop logo, hours, phone, and the recommended service. The live designer handles the rest.
Try the live designer →Service reminders are the highest-ROI auto repair playbook, but PostKnock also runs new-customer acquisition, oil change recall, and seasonal promos. See the full lineup on the auto repair hub.
See all auto repair campaigns →500–1,500 customers for the first run. Smaller than 500 and the per-card economics get tight against your subscription; larger than 1,500 and your front desk will struggle to handle the call queue. If you have 3,000+ past customers, split into two cohorts and stagger by 30 days.
PostKnock doesn't pull from your shop management system directly — you export the customers you want to mail. Most shops filter by 'last visit date 90+ days ago' or 'last visit date 6 months ago' depending on the service interval. Mileage-based filtering happens in your shop software before the CSV export.
$X off a specific service (oil change + tire rotation, brake inspection, AC service) outperforms percentage discounts and generic coupons. The specificity matters — customers respond to "$25 off your 60K service" more than they do to "15% off any service." Save percentage discounts for Wave 2 to add a fresh angle.
Yes, but with a different message. Customers 18+ months out are likely shopping elsewhere or have moved. A win-back card with a stronger offer (free oil change, $50 off any service over $200) and a personal note converts better than the standard reminder. PostKnock supports per-segment offers in the same campaign.
7–10 days after delivery is the sweet spot. USPS First-Class typically delivers in 3–5 business days, so calling on day 7–10 means the customer has likely seen the card. Earlier feels pushy; later means they've forgotten the card.
Stop running ads to strangers. Start mailing the customers you already know are due.
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1 ANA (Association of National Advertisers), Response Rate Report 2023, published February 2024.