Car Fluids Checklist
A comprehensive guide to inspecting and maintaining essential car fluids, ensuring engine longevity, braking safety, and optimal cooling performance for any vehicle.
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| Item | Priority | Who | Time | What to check (Pass/Fail) | If failed (Next step) |
|---|---|---|---|---|---|
| Engine Oil Level | Required | DIY | 3 min | Between Min/Max marks on dipstick | Top off with correct grade |
| Engine Oil Condition | Required | DIY | 1 min | Amber/Brown; no milky or gritty texture | Schedule oil and filter change |
| Coolant Level (Reservoir) | Required | DIY | 2 min | Between Full/Low marks on plastic tank | Add 50/50 mix when engine is cold |
| Coolant Color/Clarity | Recommended | DIY | 1 min | Bright green, orange, or pink; not rusty | Flush and refill cooling system |
| Brake Fluid Level | Required | DIY | 2 min | Visible between lines on reservoir | Inspect pads; top off fluid |
| Brake Fluid Color | Recommended | DIY | 1 min | Clear to light golden; not dark/black | Flush brake system (Shop) |
| Power Steering Fluid | Recommended | DIY | 3 min | Level on dipstick or reservoir side | Add fluid; check for hose leaks |
| Transmission Fluid Level | Recommended | DIY/Shop | 5 min | Check while idling (if applicable) | Top off; consult manual for procedure |
| Transmission Fluid Color | Optional | DIY | 1 min | Pink/Red; no burnt smell | Service transmission (Shop) |
| Windshield Washer Fluid | Recommended | DIY | 2 min | Reservoir full or near top | Refill with seasonal washer mix |
| Differential Fluid (RWD/4WD) | Optional | Shop | 10 min | No leaks around the housing | Check/Fill at next service interval |
| Battery Electrolyte (if applicable) | Optional | DIY | 5 min | Fluid covers internal lead plates | Add distilled water only |
| Ground Leak Inspection | Required | DIY | 2 min | No puddles under the parked car | Identify fluid color and source |
| Radiator Hose Condition | Required | DIY | 3 min | No cracks, bulges, or soft spots | Replace hose immediately |
| Oil Fill Cap Underside | Recommended | DIY | 1 min | Clean; no white 'mayonnaise' sludge | Check for head gasket issues |
| Brake Line Visual Check | Recommended | DIY | 5 min | No wetness or corrosion on lines | Repair brake lines immediately |
| Clutch Fluid (Manual Trans) | Optional | DIY | 2 min | Level is within range | Top off; check for slave cylinder leaks |
| Transfer Case Fluid (4WD) | Optional | Shop | 10 min | No visible seepage or leaks | Service at manufacturer interval |
Use this table as a monthly routine to catch small issues before they become expensive repairs. Mark each item as 'Pass' only if it meets both the level and condition criteria described.
If you find a fluid is consistently low, do not just keep topping it off. This indicates a leak or a mechanical consumption issue that needs professional diagnosis. Keep a small logbook in your glovebox to track when you checked and what you added.