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Vehicles using J8S-A704 engine list:

  • RENAULT - 21 Diesel (48kW) 1986–1995

Recommended oil for engine J8S-A704 engine.

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Questions strictly about engine codes (brand/model/engine type/production years).
Oil Specs Comparison
Castrol GTX Diesel 15W-40
Castrol GTX Diesel 15W-40
SAE 15W-40 ✔
ACEA A3/B4 ✔
API CK-4 ✔
API CJ-4 and earlier ✔
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Mobil Delvac MX 15W-40
Mobil Delvac MX 15W-40
SAE 15W-40 ✔
ACEA A3/B4 ✔
API CK-4 ✔
API CJ-4 and earlier ✔
Cummins CES 20086 / 20081 ✔
Volvo VDS-4.5 ✔
Mack EOS-4.5 ✔
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Total Rubia TIR 6400 15W-40
Total Rubia TIR 6400 15W-40
SAE 15W-40 ✔
ACEA A3/B4 ✔
API CK-4 ✔
API CJ-4 and earlier ✔
MB-Approval 228.31 ✔
MAN M3575 ✔
Renault RLD-3 ✔
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Oil specification key
✔ – Meets the required specification
❓ – Not explicitly stated (use caution; check your vehicle manual)
❌ – Does not meet required specification. Use may cause engine issues.
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Answer generated by AI.

Oil specifications for J8S-A704 engine

SAE 15W-40
ACEA A3/B3
API CF-4
NO INFO -

Most common problems, symptoms & fixes for the J8S-A704 engine.

Engine J8S-A704

Symptoms:
- Hard starting or failure to start, especially in cold conditions
- Rough idling and loss of power during acceleration
- Excessive smoke from the exhaust, typically black or blue
- Unusual engine noises such as knocking or rattling
- Increased fuel consumption and poor overall performance

Diagnosis:
- Check glow plugs for proper operation; faulty glow plugs cause cold start issues
- Inspect fuel injection pump and injectors for leaks, clogging, or wear
- Examine air filter and intake system for blockages reducing airflow
- Test compression to identify worn piston rings or valves causing power loss
- Look for signs of oil leaks or contamination indicating gasket or seal failure

Fixes:
- Replace defective glow plugs to improve cold starting reliability
- Clean or rebuild fuel injectors and injection pump to restore fuel delivery
- Change air filter regularly and clean intake ducts to ensure proper airflow
- Repair or replace worn engine components such as piston rings or valves after compression testing
- Address oil leaks by replacing gaskets, seals, or worn parts to prevent engine damage
- Regular oil and filter changes to maintain lubrication and reduce wear

Prevention:
- Follow recommended maintenance schedule for oil changes, filter replacements, and fuel system servicing
- Use quality diesel fuel and additives to keep injectors clean and prevent deposits
- Avoid prolonged idling and harsh driving to reduce engine stress
- Regularly inspect and replace glow plugs before cold seasons
- Keep air intake system clean and free from debris to ensure efficient combustion

By adhering to these diagnostic steps and maintenance practices, owners of vehicles equipped with the J8S-A704 engine can minimize common issues and maintain reliable engine performance.
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* The engine oils listed on this website are general recommendations based on publicly available data. For the most accurate and suitable oil type for your vehicle, always refer to your car's owner manual or technical documentation. Oil specifications may vary depending on engine version, production year, driving conditions, and other factors. If in doubt, consult your vehicle manufacturer or a certified mechanic.