Factory maintenance schedule OEM · verified
Normal service, condensed from the factory interval matrix.
| Every 30,000 mi | Oxygen Sensor (replace) |
Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 1988 735iL.
The 1988 BMW 735iL is a sedan equipped with an engine that holds 6.1 qt of oil and is specified for 15W‑40, 10W‑40, or 10W‑30 API SJ viscosities. Overall, the model has accumulated 14 owner complaints, with the predominant issues falling under the engine and engine cooling category and a single recall issued. Later model years from 1990 to 1992 show only one reported complaint in each year, indicating a relatively low complaint frequency in the subsequent reliability record. Thus, the 1988 model year marks the beginning of a lineage that, by the early 1990s, demonstrated limited mechanical complaints.
Fluid capacities, tune-up values and fuel economy at a glance.
Capacities, torques and tune-up values from the factory service manual.
This engine holds 6.1 qt of 15W-40 / 10W-40 / 10W-30 API SJ engine oil, DOT 4 brake fluid.
| Brake Fluid | DOT 4 |
| Differential Gear Oil Capacity | 4 Pints |
| Engine Coolant | ETHYLENE GLYCOL |
| Engine Oil | 15W-40 · API · 10W-40 · 10W-30 · 5W-30 |
| Engine Oil Capacity | 6.1 qt |
| Power Steering Fluid | ATF |
Normal service, condensed from the factory interval matrix.
| Every 30,000 mi | Oxygen Sensor (replace) |
Owner-reported issues, recalls, investigations and service bulletins on record with NHTSA — an unfiltered look at what owners actually experience.
The 1988 BMW 735iL sits just before the first federal record in 1990, which shows a modest rise in complaints (from 0 in 1992 to 1 in 1990) and recalls (1 in 1990, 2 in 1991–1992). Compared to the years immediately following, the 1990–1992 period displays a gradual increase in recalls while complaints remain low, indicating a relatively stable safety profile for the generation. In 1988, the top complaint areas were Engine & Engine Cooling (5), Seats (3), Exterior Lighting (2), and Vehicle Speed Control (1), with only 2 crash complaints and no fire complaints reported. This pattern suggests that the 1988 model experienced typical early‑generation issues—particularly cooling and seating—yet no catastrophic failures. Overall, the 1988 735iL appears to be a reasonable buy, provided the vehicle’s cooling system and seat components are in good condition.
All 14 complaints on record, top 7 components.
Source: NHTSA Office of Defects Investigation complaint database.
Showing 1 of 1 campaigns on record for this vehicle.
VEHICLE DESCRIPTION: PASSENGER VEHICLES. A MALFUNCTION OR FAILURE OF A COOLANT SYSTEM COMPONENT, SUCH AS A THERMOSTAT, WATER PUMP, OR FAN BELT, CAN RESULT IN SIGNIFICANTLY INCREASED COOLANT TEMPERATURE AND SYSTEM… Remedy: DEALERS WILL INSTALL A NEW DESIGN RADIATOR CAP TO CONTROL PRESSURE AND PROVIDE GREATER COOLANT OVERFLOW IN THE EVENT OF OVERHEATING.
Showing 1 of 1 bulletins on record with NHTSA.
| Bulletin | Date | Component | Summary |
|---|---|---|---|
| B510819 | 2024-01-16 | Electrical System | The basic conditions for initializing the power windows are not met. |
The most common OBD-II codes for this vehicle's emissions system. These are standardized SAE J2012 definitions, not vehicle-specific fault reports.
Decode factory build data for a specific vehicle by VIN.
Find every vehicle that shares this one's battery, bulbs, oil capacity, platform or parts.
Cross-vehicle references for the kinds of data on this page.
6.1 qt of HIGH PERFORMANCE MINERAL OILS: ABOVE 5 degrees F: 15W-40 API SJ, SL OR SM, -5 degreesF TO 68 degrees F: 10W-40 API SJ, SL OR SM, 5 degreesF TO 50 degrees F: 10W-30 API SJ, SL OR SM, BELOW 50 degrees F: 5W-30 API SJ, SL OR SM, BELOW 32 degrees F:, per the factory manual.
NHTSA lists 1 recall campaign(s) for this model year. Check your specific vehicle by VIN.