TT AUTO'S Journal
Practical notes for German car ownership
Buying judgment, maintenance habits, ownership risk, and the engineering context behind the next repair bill.
Featured analysis
A practical starting point selected by the editorial team.
BMW N47 vs B47: Which Used Diesel Is the Safer Buy?
A practical comparison of BMW N47 and B47 diesel engines for used buyers, focused on timing-chain risk, emissions systems, scan data, and service proof.
BMW N47 vs B47: Which Used Diesel Is the Safer Buy? The short answer is that the B47 is normally the safer default. It improved the main buying worry around the older N47, but it is not r...
Latest from the workshop
Fresh ownership thinking, buyer judgment, and maintenance notes.
Audi 2.0 TDI vs BMW B47: Which Diesel Should You Trust?
A cross-brand diesel used-buy guide comparing Audi 2.0 TDI and BMW B47 engines through emissions systems, gearbox history, parts support, and inspection evidence.
Audi A4 vs BMW 3 Series: Which Used Saloon Makes More Sense?
A used-buyer comparison of Audi A4 and BMW 3 Series reliability, engines, gearboxes, driving feel, and inspection priorities.
Mercedes OM651 vs OM654: Used Diesel Buying Guide
How to choose between Mercedes OM651 and OM654 diesels by looking at age, emissions systems, injector data, service records, and diagnostic evidence.
Mileage Danger Zones on Used German Cars
How to think about 60k, 90k, 120k, and 150k mile risk zones on used BMW, Mercedes-Benz, Audi, and Volkswagen models.
VW Golf vs Audi A3: Same Family, Different Used-Buy Logic
A practical comparison of Volkswagen Golf and Audi A3 used buying risk, shared VAG engines, DSG service history, cabin value, and inspection priorities.
BMW 3 Series B47 Diesel vs B48 Petrol: Which Should You Buy?
A practical used-buyer comparison of BMW B47 diesel and B48 petrol engines based on driving pattern, inspection evidence, running risk, and ownership cost.
How to Spot Recently Cleared Fault Codes Before Buying
A clean dashboard does not always mean a fault-free car. Readiness monitors, scan history, and a proper drive cycle can reveal recently erased problems.
How to Test-Drive a Used German Car Properly
A useful test drive needs cold-start, urban, motorway, braking, steering, gearbox, and parking checks—not a five-minute loop with the radio on.
Petrol vs Diesel: Match the Engine to Your Real Driving
The better used-car engine depends on trip length, annual distance, load, emissions-system use, fuel cost, and maintenance tolerance.
What Tire Wear Reveals Before You Buy a Used Car
Uneven tread can expose alignment problems, neglected rotation, worn suspension, incorrect pressure, or a poorly repaired accident.
Why Low Mileage Can Still Be Risky
Low mileage looks attractive, but storage, short trips, old fluids, and missing service proof can still create expensive used-car risk.
The First 1,000 km After Buying a Used German Car
What to do immediately after buying a used German car: fluids, scans, leaks, tires, brakes, and preventive maintenance.
How to Read a Used-Car Service Invoice
A practical guide to reading service invoices so you know what was actually repaired, replaced, inspected, or ignored.
Why Cold Starts Reveal Hidden Problems
Cold starts expose timing noise, injector issues, smoke, idle instability, weak batteries, and neglected maintenance better than warm test drives.
When to Walk Away From a Used Car
Some used-car red flags are negotiable, but others are strong reasons to leave the deal alone.
BMW Cooling System Buyer Notes
Why BMW cooling systems deserve attention during a used-car inspection, especially plastics, housings, coolant residue, and heat cycling.
Why Service History Matters More Than Mileage
A practical ownership note on why documented maintenance usually predicts German car reliability better than mileage alone.
5 Used BMW Mistakes Buyers Keep Making
The repeat mistakes that turn an exciting used BMW purchase into an avoidable repair bill.
Mercedes Electronics: Used-Buyer Notes
Why battery health, stored faults, modules, and intermittent electronics matter when inspecting a used Mercedes-Benz.
Audi Oil Consumption Questions Before Buying
What to ask and inspect before buying an Audi where oil consumption history, engine generation, and service proof matter.
Should You Buy a German Diesel in 2026?
A practical look at diesel ownership, city use, emissions systems, and when a used German diesel still makes sense.
Why DSG Service History Matters on Volkswagen
A Volkswagen DSG can be excellent when serviced properly, but missing fluid history changes the buying risk.
When Is an Oil Leak Actually Serious?
Not every oil leak is a disaster, but location, smell, belt contact, and repair access decide the real risk.
How to Budget After Buying a Used German Car
A realistic first-year budget mindset for used German car ownership: fluids, tires, brakes, leaks, diagnostics, and preventive work.
Why a Pre-Purchase Scan Is Worth It
A diagnostic scan before buying can reveal stored faults, emissions issues, sensor patterns, and recently cleared problems.