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DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1984 Cadillac DeVilleOil Type & Capacity
OEM spec from the factory service manual for the 2D Coupe, 4.1 8, 200-4R/MW9 variant.
Quick Answer
Oil Type
SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to over 100Deg.F), 15W-40 (10Deg.F to over 100Deg.F), 20W-20, 20W-40, & 20W-50 (20Deg.F to over 100Deg.F), 30 (40Deg.F to over 100Deg.F)
Capacity (w/ Filter)
4.00 QTS.
3.78 L
Variant
2D Coupe, 4.1 8, 200-4R/MW9
Source: Factory service manual — 1984 Cadillac DeVille 2D Coupe, 4.1 8, 200-4R/MW9. View full manual section →
What You'll Need
Engine Oil
SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to over 100Deg.F), 15W-40 (10Deg.F to over 100Deg.F), 20W-20, 20W-40, & 20W-50 (20Deg.F to over 100Deg.F), 30 (40Deg.F to over 100Deg.F) for Cadillac DeVille
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Oil Filter
Cadillac DeVille Oil Filter
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Tool
Oil Filter Wrench
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Kit
Funnel + Drain Pan Kit
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Frequently Asked Questions
- What type of oil does a 1984 Cadillac DeVille take?
- The 1984 Cadillac DeVille requires SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to over 100Deg.F), 15W-40 (10Deg.F to over 100Deg.F), 20W-20, 20W-40, & 20W-50 (20Deg.F to over 100Deg.F), 30 (40Deg.F to over 100Deg.F). The exact spec may vary slightly by engine variant — this page shows the OEM recommendation for the 2D Coupe, 4.1 8, 200-4R/MW9 configuration.
- How much oil does a 1984 Cadillac DeVille need?
- The 1984 Cadillac DeVille takes 4.00 QTS. (3.78 L) of engine oil with the filter replaced.
- Can I use synthetic oil in my 1984 Cadillac DeVille?
- Yes — synthetic oil that meets the SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to over 100Deg.F), 15W-40 (10Deg.F to over 100Deg.F), 20W-20, 20W-40, & 20W-50 (20Deg.F to over 100Deg.F), 30 (40Deg.F to over 100Deg.F) specification is acceptable and often preferred for better protection and longer change intervals.
- What happens if I use the wrong oil in my 1984 Cadillac DeVille?
- Using oil that does not meet the SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to over 100Deg.F), 15W-40 (10Deg.F to over 100Deg.F), 20W-20, 20W-40, & 20W-50 (20Deg.F to over 100Deg.F), 30 (40Deg.F to over 100Deg.F) specification can reduce engine protection, increase wear, and potentially void warranty coverage. Always use oil that meets the OEM spec.