Car Oils and Fluids — Complete Vehicle Maintenance Fluid Guide

Engine oil is only one of several critical vehicle fluids. This guide covers all automotive fluids and maintenance requirements.

Essential Vehicle Fluids

Engine Oil:

Function: Lubricate engine components; cool; clean

Interval: 5,000-15,000 km (depends on oil type)

Cost: KES 280-600/L

Coolant:

Function: Cool engine; prevent freezing

Interval: 40,000-60,000 km or 2 years

Cost: KES 300-500/L

Transmission Fluid (Manual):

Function: Lubricate gear mechanisms

Interval: 40,000-80,000 km

Cost: KES 400-800/L

Transmission Fluid (Automatic):

Function: Lubricate; provide hydraulic pressure

Interval: 40,000-100,000 km (varies by design)

Cost: KES 500-1,000/L

Brake Fluid:

Function: Transmit brake pressure

Interval: Every 2 years (absorbs moisture)

Cost: KES 200-400/L

Power Steering Fluid:

Function: Hydraulic pressure for steering

Interval: 40,000-80,000 km

Cost: KES 250-450/L

Differential Fluid (4x4/AWD):

Function: Lubricate differential gears

Interval: 40,000-100,000 km

Cost: KES 300-600/L

Fluid Change Schedule

Fluid	Interval	Cost (KES)
Engine Oil	5,000-15,000 km	2,500-8,000
Coolant	40,000-60,000 km or 2 yrs	2,000-5,000
Transmission	40,000-100,000 km	3,000-8,000
Brake Fluid	2 years	1,500-3,000
Power Steering	40,000 km	1,500-3,000
Differential	40,000-100,000 km	2,000-6,000

Annual Total: KES 12,500-33,000 depending on vehicle and schedule adherence.

Best Practices: Fluid Management

Engine Oil:

Check monthly (visual inspection)

Change per schedule (don't skip)

Use OEM-approved viscosity

Change filter with oil

Coolant:

Check level when engine cool

Replace per interval (prevent corrosion)

Use distilled water for top-ups (not tap water)

Check for leaks (green/orange spots on ground)

Transmission Fluid:

Check per manual (not all vehicles have dipstick)

Replace per schedule (worn fluid affects shifting)

Use OEM-specified type (synthetics not interchangeable)

Brake Fluid:

Check monthly (absorbs moisture; darkens over time)

Replace every 2 years (mandatory; prevents brake failure)

Don't mix old and new fluid

High replacement priority (safety-critical)

Power Steering:

Check monthly (low fluid causes steering difficulty)

Replace per interval (degraded fluid causes stiffness)

Real Case Study: Fluid Maintenance Impact

Scenario: 15-year-old sedan, 180,000 km, poor maintenance history

Initial Condition:

Oil: Overdue by 5,000 km; very dark

Coolant: Original (brown; deteriorated)

Transmission: Last changed 80,000 km ago

Brake fluid: Last changed 3 years ago (safety risk)

Issues Observed:

Rough idling (poor oil quality)

Engine running hot (coolant degraded)

Transmission hesitation (fluid worn)

Spongy brakes (moisture in brake fluid; corrosion)

Maintenance Program:

1. Complete fluid flush (all fluids)

2. New oil, filter

3. Fresh coolant

4. Transmission fluid and filter

5. Brake fluid (complete system flush)

6. Power steering fluid

Results:

Engine: Smoother operation

Cooling: Normal temperature

Transmission: Smooth shifting restored

Brakes: Firm, responsive

Steering: Light, responsive

Conclusion: Fluid maintenance is critical for reliability and safety.

Fluid Selection Guide

Engine Oil:

Modern car: 5W-30 semi-synthetic

Older car: 10W-40 mineral/semi-synthetic

High-mileage: 15W-40 thicker

Coolant:

Most cars: Ethylene glycol (green/red)

Some Toyotas: Pink coolant (OAT)

Check manual (don't mix types)

Transmission:

Manual: Gear oil (GL-4 or GL-5)

Automatic: ATF (specific to transmission type)

CVT: Special CVT fluid (not ATF)

Brake Fluid:

Most cars: DOT 3 or DOT 4

Check manual for specification

Action Checklist

Monthly:

□ Check oil level

□ Check coolant level

□ Check brake fluid level (color)

□ Check transmission fluid level

Per Service Schedule:

□ Change oil and filter

□ Replace coolant (per interval)

□ Replace transmission fluid (per interval)

□ Replace brake fluid (every 2 years)

□ Replace power steering fluid (per interval)

Crown Oils Expert Insight

Complete fluid maintenance is essential for vehicle longevity and safety. Engine oil is just one component; all fluids require regular attention.

Crown Oils provides comprehensive fluid guidance and products for all vehicle maintenance needs.

Contact Crown Oils for fluid maintenance consultation.

Car Oils and Fluids — Complete Vehicle Maintenance Fluid Guide

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