NHC MOTORS · SERVICE RECORD
Mercedes-Benz CLA After a Used-Car Purchase: What We Kept and What We Replaced
What should be serviced first after buying a used car? At 44,818 km, this Mercedes CLA had its battery and tyres measured and its coolant, underbody and brakes inspected. The battery was retained; the engine oil, brake fluid and filters were replaced.
Vehicle/intake: Mercedes-Benz CLA, 44,818km, post-purchase used-car inspection
Findings: battery rated GOOD BATTERY (800CCA rated, 811CCA measured, 12.74V), tyre tread front 6.5 / 6.7mm, rear 3.7 / 3.6mm, coolant, undercarriage and brake inspection
Work: engine oil and brake fluid replacement, air filter and cabin filter replacement
Result/care: battery and front tyres kept without replacement, on measured record; rear tyres flagged for wear monitoring
01 / NHC MOTORS
How We Decide the Order of Work on a Used Car
A used-car inspection combines present condition with available service history. Measurements help distinguish items to retain from those needing attention.
For this CLA, we recorded battery and tyre readings and serviced fluids and filters, establishing a useful reference for future visits.
02 / NHC MOTORS
Battery — Measured, Not Replaced
We tested the AGM battery with a Midtronics CPX900. The verdict was GOOD BATTERY: 811CCA measured against an 800CCA rating, at 12.74V (measured at 40°C). Since it performed above its rating, it was not replaced.
These figures stay on record; measuring the same way at future services shows exactly when the battery starts to decline.
03 / NHC MOTORS
Tyre Tread — Front-to-Rear Difference in Numbers
The minimum readings across each tyre were 6.5 mm front left, 6.7 mm front right, 3.7 mm rear left and 3.6 mm rear right. The inspection device classified all four as normal.
The rear tyres had less tread remaining. Their wear should be followed at later inspections, together with age, cracking and damage when deciding replacement.
| Wheel | Minimum tread |
|---|---|
| Front left | 6.5mm |
| Front right | 6.7mm |
| Rear left | 3.7mm |
| Rear right | 3.6mm |
04 / NHC MOTORS
Coolant, Undercarriage and Brake Inspection
We checked the coolant condition and inspected the undercarriage and brakes on the lift. On a used car, some things — such as underbody damage or repair traces — can only be seen from underneath, so this is a fixed part of any post-purchase inspection.
These items were handled as inspection only at this visit, with no parts replaced, and they stay on the list to be checked at regular services going forward.
05 / NHC MOTORS
Fluid and filter service as a maintenance reference
Engine oil and brake fluid were exchanged, and the air and cabin filters replaced. The used and new filters were photographed together for comparison.
This visit at 44,818 km provides a maintenance reference. Future intervals should reflect distance, elapsed time and actual condition.
Questions about this work
Should the battery be replaced right after buying a used car?
Measure first, then decide. This car's battery tested at 811CCA against an 800CCA rating at 12.74V, with a GOOD BATTERY verdict, so it was kept and the figures were recorded instead.
The tyres passed inspection — why are the rears flagged for monitoring?
The pass reflects the test equipment's criteria at the time of measurement. Compared with 6.5 / 6.7mm at the front, the rears measured 3.7 / 3.6mm — noticeably more worn — so they were noted to be checked first at the next service.
Related guides and work
Post-Purchase Used-Car Inspection
We measure your newly purchased car's battery, tyres and fluids and help you sort out what to keep on record and what to replace. When you contact us, please have the purchase date, current mileage and any verified service history ready.
We explain the scope of any repairs and the estimate before proceeding with your approval.
Call 031-258-1617Book on NaverBy appointment only · Gwonseon-gu, Suwon