Automated Weekday Car Care Tips: n8n + Perplexity + GPT Image

Automate your weekday car care posts—research, generate an image, and publish to Facebook & Instagram

This n8n workflow automatically runs every weekday at 9:00 AM to find a locally relevant car care tip with Perplexity, generate a square image using OpenAI GPT Image, and publish the post to Facebook and Instagram via PostWire—while logging results in Google Sheets and alerting you by email if anything fails.

What this workflow does

• Schedules daily updates: Uses a schedule trigger to run every weekday at 9:00.
• Avoids duplicate topics: Reads previously posted tips from Google Sheets and compiles a list of past topics to prevent repeats.
• Researches a city- and season-relevant tip: Calls Perplexity to produce a topic, verified facts, an image prompt, and platform-specific captions with citations.
• Stops on invalid/duplicate output: Halts if the generated topic is empty or already exists in the Google Sheets log.
• Generates a square creative: Uses OpenAI GPT Image to create a 1024×1024 image.
• Publishes via PostWire: Posts the image and captions to Facebook and Instagram through PostWire.
• Tracks outcomes & self-heals: Appends a “posted” row to Google Sheets when successful; otherwise logs partial/failure details and sends a Gmail alert with what you need to fix.

Use cases

• Operators of a car detailing or auto service SaaS who want consistent social content without manual research.
• n8n users building an “evergreen tips” engine for Facebook/Instagram with citations and sourcing.
• Automation engineers who want reliable weekday publishing with logging, de-duplication, and error notifications.

Technical details

• n8n nodes/integrations: schedule trigger, if, set, gmail, aggregate, perplexity, and sticky note.
• Outputs: Google Sheets rows with date, topic, status, links, sources, and a note.
• Publishing: PostWire using your PostWire API credentials with Facebook Page and Instagram connected.
• Image generation: OpenAI GPT Image at 1024×1024.