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1998 Volvo C70 Conv

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 1998 C70 Conv.

The 1998 Volvo C70 Conv is the brand’s midsize convertible built on Volvo’s dedicated C70 platform, pairing the open‑body design with the marque’s customary inline powerplant. Its service schedule calls for 6.1 qt of oil, typically a 5W‑30 or 10W‑30 API‑grade fluid, reflecting the engine’s modest displacement and cooling needs. Owner feedback for this year is unusually low, with only seven complaints recorded, the most frequent issue centering on service‑brake hydraulics, while four manufacturer recalls address isolated component concerns. In the context of the model’s broader reliability record, the 1998 iteration stands out as a comparatively trouble‑free example, suggesting a relatively dependable year for researchers tracking long‑term durability.

Model year2004 2003 2002 2001 2000 1999 1998

Quick specs

Fluid capacities, tune-up values and fuel economy at a glance.

Engine oil capacity6.1 qtOEM · verified

Engine oil type5W-30 / 10W-30 APIOEM · verified

Lug nut torque81 ft-lbsOEM · verified

Fitment & sizes

Replacement part sizes and factory part numbers — battery, bulbs, filters and belts.

From the factory this vehicle uses a BCI 47 · 520 CCA battery, OE oil filter 3517857. Note the factory battery and front wiper blades are now discontinued — plan on a superseded or quality aftermarket equivalent, which the part pages below list where known. Each part links to every other vehicle that shares it, so a part you already stock may fit more of your fleet than you'd expect.

Battery groupBCI 47 · 520 CCAOEM · verified

OE service part numbers OEM · verified

Engine oil filter	3517857
Engine air filter	9186262
Fuel filter	30671182
Battery	9459948 discontinued
Front wiper blades	31276592 discontinued
Serpentine belt	9146844 alt 9146973
Thermostat	271664 alt 6842214
Cabin air filter	9171296

Full specifications

Engine, drivetrain, dimensions and economy.

Dimensions & weight NHTSA vPIC

Overall length	185.8 in
Overall width	71.7 in
Overall height	55.5 in
Wheelbase	104.7 in
Track (front / rear)	59.8 / 59.4 in

Service quick specs OEM factory data

Capacities, torques and tune-up values from the factory service manual.

This engine holds 6.1 qt of 5W-30 / 10W-30 API engine oil, DOT 4 brake fluid. Torque lug nuts to 81 ft-lbs, the oil drain plug to 25.0 ft-lbs. The firing order is 1-2-4-5-3.

Lubricants & capacities

Brake Fluid	DOT 4
Engine Oil	5W-30 · API · 10W-30
Engine Oil Capacity	6.1 qt
Engine Oil	5W-30 · API · 10W-30
Engine Oil Capacity	6.1 qt
Power Steering Fluid	SYNTHETIC

Engine torques

Intake Manifold to Engine Bolts	13 ft-lbs
Exhaust Manifold to Cylinder Head Bolts	18 ft-lbs
Intake Manifold to Engine Bolts	13 ft-lbs
Exhaust Manifold to Cylinder Head Bolts	18 ft-lbs
Engine Oil Pan Drain Plug	25.0 ft-lbs
Oil Pump to Cylinder BLock Bolts/Studs	7 ft-lbs

Chassis torques

Lug Nuts

81 ft-lbs

Ignition

Cylinder Firing Order	1-2-4-5-3
Curb Idle Speed (No Load)	Turbo: 850 rpm
Curb Idle Speed Variance (No Load)	Turbo: 50 rpm
Curb Idle Speed (No Load)	Ex. Turbo: 850 rpm
Curb Idle Speed Variance (No Load)	Ex. Turbo: 50 rpm
Ignition Coil Primary Resistance	0.5-1.5 ohms
Ignition Coil Secondary Resistance	8000-9000 ohms
Spark Plug Gap	0.020-0.030 in

Battery & A/C

Refrigerant	R134a
Refrigerant Capacity	Cold market vehicles, 1.8; warm market vehicles, 1.7. Refer to decal on lefthand suspension tower to determine vehicles market type. lbs
Oil Type	Volvo Part No. 11 61 407-0, or equivalent.
Oil Capacity	6.76 oz
Standard BCI Group Number	47
Standard BCI Cranking Performance	520 cca
Standard BCI Group Number	47
Standard BCI Cranking Performance	520 cca

Service checks

RPM	43.0 rpm
Engine Oil Pressure	14.5 psi @ 750 rpm, 50.76 psi @ 4000

Brakes

Torque Caliper to Bracket	22 ft-lbs
Torque to Knuckle	75 ft-lbs / 45 ft-lbs
Minimum Pad Thickness	Front: 0.079; Rear: 0.079 in
Rotor Max Parallel Variation	0.0003 in
Rotor Runout Limit	0.0014 in / 0.0019 in
Rotor Nominal Thickness From	1.024 in / 0.378 in
Rotor Nominal Thickness To	1.024 in / 0.378 in
Rotor Minimum Machining	0.937 in / 0.35 in

Multi-step torque procedures OEM · verified

Connecting Rod (Large End) Bearings — tightening sequence 1 stages

15 ft. lbs., Step 2: 90

15 ft. lbs

Engine Flywheel Bolts — tightening sequence 1 stages

33 ft. lbs., Step 2: 65

33 ft. lbs

Factory maintenance schedule OEM · verified

Normal service, condensed from the factory interval matrix.

Under the factory schedule, replace the engine oil and filter every 5,000 mi; spark plugs every 30,000 mi.

Every 5,000 mi	Engine Oil (drain & refill) · Engine Oil Filter (replace) · Power Steering System (inspect)
Every 10,000 mi	Battery (inspect electrolyte level) · Body Latches, Locks & Hinges (inspect) · Brake System (inspect) · Clutch Pedal Assembly (inspect) · Driveshaft U-Joint (inspect) · Engine Coolant System (leak inspection)
Every 15,000 mi	Cabin Air Filter (replace)
Every 20,000 mi	Driveshaft Support Bearing (inspect) · EGR System (inspect) · Steering Gear Box Assembly (inspect) · Suspension Shock or Strut (inspect)
Every 30,000 mi	Brake Hydraulic System (drain, refill & bleed) · Engine Air Filter Element (replace) · Spark Plugs (replace)
At 60,000 mi	EGR System (inspect)
Every 60,000 mi	Accessory Drive Belt (inspect) · PCV System (inspect)
Every 70,000 mi	Timing Belt (replace)
Every 100,000 mi	Fuel Filter (replace)

Reliability & federal safety record

Owner-reported issues, recalls, investigations and service bulletins on record with NHTSA — an unfiltered look at what owners actually experience.

Owner complaints about the 1998 Volvo C70 Conv lead in one area — the service brakes, hydraulic, 2 of 7 reports (29%), well ahead of the next concern. None of this vehicle's 4 recall campaigns target the service brakes, hydraulic, so those reports read as owner-reported wear-and-tear rather than an acknowledged defect. 0 of the reports describe a crash and 0 a fire — a small share of the total, but worth weighing against the service brakes, hydraulic pattern above. These are tallies of what owners actually reported to the federal government, not an editorial score — and higher-selling models naturally rack up more reports.

Open recalls

NHTSA campaigns

214

Service bulletins

Manufacturer communications

ODI investigations

Office of Defects Investigation

Owner complaints

0 involved a crash · 0 a fire

Owner complaints filed with NHTSA, by component

All 7 complaints on record, top 6 components.

Service Brakes, Hydraulic2

Steering1

Structure1

Vehicle Speed Control1

Latches/Locks/Linkages1

Tires1

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 2 of 4 campaigns on record for this vehicle.

04V504000Exterior Lighting:Headlights:SwitchReported 21/10/2004

ON CERTAIN PASSENGER AND SPORT UTILITY VEHICLES, OVER AN EXTENDED PERIOD OF TIME, THE HEADLIGHT SWITCH MAY CEASE TO FUNCTION. Remedy: ON VEHICLES WITH AN ORIGINAL OEM SWITCH, DEALERS WILL REPLACE THE HEADLIGHT SWITCH. ALL OTHER VEHICLES WILL BE INSPECTED TO DETERMINE IF THE SWITCH HAS EEN DAMAGED AND REPLACE…

99V236000Air Bags:FrontalReported 30/08/1999

VEHICLE DESCRIPTION: PASSENGER VEHICLES. THE FRONTAL PASSENGER AIR BAG MAY BE OVERLY SENSITIVE TO CERTAIN ELECTROSTATIC DISCHARGE. Remedy: DEALERS WILL INSTALL AN ADDITIONAL GROUND WIRE IN THE PASSENGER SIDE TO ASSURE SUFFICIENT GROUNDING.

Technical service bulletins NHTSA · verified

Showing 5 of 214 bulletins on record with NHTSA.

Bulletin	Date	Component	Summary
C00009	2023-07-21	Unknown Or Other	COMPLIMENTARY UPGRADE C00009 DESCRIPTION.
TJ3656330	2023-06-12	Unknown Or Other	Rubber cushion
Special Tools Bu	2022-05-12	Unknown Or Other	The Deutronic DBL-1200 is an advanced battery maintainer/charger with the flexibility to…
Service Manager	2022-05-06	Equipment	ICUP/Google Built-In Diagnostic Operations
356EN01	2022-02-09	Equipment	VIDA QR Scanner Mobile App

Common OBD-II trouble codes

The most common OBD-II codes for this vehicle's emissions system. These are standardized SAE J2012 definitions, not vehicle-specific fault reports.

P0420

Catalyst system efficiency below threshold — Bank 1

P0300

Random / multiple cylinder misfire detected

P0171

System too lean — Bank 1

P0455

Evaporative emission system leak detected — large leak

P0128

Coolant thermostat below regulating temperature

P0442

Evaporative emission system leak detected — small leak

VIN tools

Decode factory build data for a specific vehicle by VIN.

VIN

Decode a VIN to confirm the transmission and build data for a specific C70 Conv. OEM

Build data

Plant, GVWR class, engine and body data for any 17-character VIN.

Recalls

Check open recall campaigns against a specific vehicle by VIN.

Vehicles with shared specs

Find every vehicle that shares this one's battery, bulbs, oil capacity, platform or parts.

Group 47 battery Vehicles taking 6.1 qt Engine oil filter 3517857 Engine air filter 9186262 Fuel filter 30671182 Battery 9459948

Reference guides

Cross-vehicle references for the kinds of data on this page.

Vehicle recalls & TSBs OBD-II trouble codes Torque specifications Maintenance schedules Fluid capacities & specs

Frequently asked

How much oil does the 1998 C70 Conv take?

6.1 qt of BELOW 86 degrees F: 5W-30 API, -4 degrees F TO 104 degrees F: 10W-30 API, per the factory manual.

Does the 1998 C70 Conv have open recalls?

NHTSA lists 4 recall campaign(s) for this model year. Check your specific vehicle by VIN.