Tire Calculator
Compare tire diameter, wheel width, offset, clearance and speedometer difference.
Compare tire sizes →Automotive tools and technical reference
D3 Orient
Compare tires and wheels, estimate fuel costs, find diagnostic tools and explore practical vehicle databases in one clear workspace.
Core tools
Start with the question you need to answer
Each tool focuses on a practical automotive decision and keeps compatibility warnings close to the result.
PCD Database
Search bolt patterns, center bore, thread size and common wheel fitment ranges.
Open wheel data →Fuel Cost
Estimate trip costs and compare yearly fuel use with consistent units and prices.
Calculate fuel cost →Diagnostics
Match diagnostic software and adapters to common vehicle platforms and tasks.
Explore diagnostics →Engine Database
Search engine codes, aliases, applications, specifications and reliability notes.
Search engine codes →Guides
Follow clear workflows for wheels, diagnostics, oil, engines and used-car checks.
Read practical guides →Additional reference
Engine Oil Guide
Check viscosity, standards and manufacturer approvals by vehicle and engine record.
Some oil records are preliminary. Confirm the exact engine, manufacturer approval and service-fill information by VIN, owner’s manual or official manufacturer data.
Popular tasks
Go directly to a common check
Use the tool that matches your immediate question, then verify safety-critical details before buying or repairing.
Trust and safety
Useful reference, with verification where it matters
D3 Orient separates practical calculations from vehicle-specific confirmation and does not present every record as fully verified.
Clear data status
Verification status and cautions are shown where the underlying section provides them.
Sources when available
Technical sources are recorded for supported data sets instead of treating all legacy records equally.
Confirm critical specifications
Use the VIN, owner’s manual, official manufacturer information and professional inspection for final decisions.