2021 BMW 420I Engine Parts

This table covers lower / conversion gasket sets for oil-pan and related joints. Typical signs include the leaks that sent the engine or gearbox to the bench. Use every gasket the set is meant for that opening — leftover unused pieces usually belong to another configuration. Read more

One part is listed for the 2021 BMW 420I — AJUSA 54263900.

This table covers the front and rear seals that keep oil in at the crankshaft. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

2 Crankshaft Seal parts for the 2021 BMW 420I come from AJUSA.

Part numbers include AJUSA 15075200 and AJUSA 15107900.

This table covers the bolts that clamp the cylinder head to the block. Read more

One part is listed for the 2021 BMW 420I — AJUSA 81065000.

This table covers the head gaskets that seal the block to the cylinder head. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

AJUSA supplies both parts for the 2021 BMW 420I.

This group includes AJUSA 10220600 and AJUSA 10220610.

This table covers multi-piece gasket sets for a cylinder-head job. Typical signs include the leaks that sent the engine or gearbox to the bench. Use every gasket the set is meant for that opening — leftover unused pieces usually belong to another configuration. Read more

One part is listed for the 2021 BMW 420I — AJUSA 52503900.

This table covers full gasket kits covering the joints opened in an engine rebuild. Typical signs include the leaks that sent the engine or gearbox to the bench. Use every gasket the set is meant for that opening — leftover unused pieces usually belong to another configuration. Read more

One part is listed for the 2021 BMW 420I — AJUSA 50453600.

This table covers the high-pressure oil pumps that fire HEUI diesel injectors. Typical signs include noise from the pump, no pressure, or fluid that never arrives at the outlet. Prime or fill the pump as the notes require. A dry start is a common way to kill a new unit. Read more

This group shows a single part: MARELLI PHP1013.

This table covers the Intake manifolds. Typical signs include an exhaust tick, a vacuum leak, or a gasket that has burned through. Replace the gaskets and hardware; a warped flange will leak with a new gasket alone. Read more

This group shows a single part: MARELLI CAB501.

This table covers the gaskets that seal the Oil Cooler. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

AJUSA supplies both parts for the 2021 BMW 420I.

Listed part numbers: AJUSA 77005900 and AJUSA 77006000.

This table covers the drain plugs in the oil pan. Read more

This group shows a single part: DORMAN 090088.

This table covers the crush washers and gaskets under the oil drain plug. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

One part is listed for the 2021 BMW 420I — AJUSA 21010400.

This table covers the oil filters that screw onto this engine's filter mount. Typical signs include low oil pressure after a service, or a filter that will not spin off because the old gasket stayed on the block. Lube the new gasket and tighten to the spec on the box; a double-gasket install dumps the sump on the first drive. Read more

2 Oil Filter parts for the 2021 BMW 420I come from 2 brands — MOBIL and VARIOUS MFR.

The High Performance / Heavy Duty section lists 1 option from MOBIL — grouped under the catalog's "High Performance / Heavy Duty" designation — the notes column spells out what sets them apart. MOBIL M1C354A is listed in this group.

In the Standard Replacement grade, VARIOUS MFR supplies 1 part: built to original-equipment specification. A representative part number is VARIOUS MFR PO99460EX.

Part numbers include MOBIL M1C354A and VARIOUS MFR PO99460EX.

This table covers the Oil Filter covers. Read more

2 Oil Filter Cover parts are listed for the 2021 BMW 420I, from DORMAN and SKP.

This group includes DORMAN 921115 and SKP SK921115.

This table covers the gaskets that seal the Timing Cover. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

This group shows a single part: AJUSA 77090600.

This table covers the gaskets that seal the Turbocharger. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

2 Turbocharger Gasket parts are listed for the 2021 BMW 420I, from AJUSA and ELRING.

This group includes AJUSA JTC11993 and ELRING 087320.

This table covers the Turbocharger Oil lines. Typical signs include a wet fitting, a rusted pipe, or a pressure loss in this circuit. Flare or thread the new line the way the notes specify; a kinked replacement will fail early. Read more

This group shows a single part: AJUSA OP10925.

This table covers the Turbocharger Oil Line Gasket O-rings. Typical signs include a seep at a fitting or a housing that weeps after a service. Lube the new O-ring with the fluid it will see, and do not roll it into the groove. Read more

This group shows a single part: AJUSA 16006101.

This table covers the Turbocharger Wastegate Solenoid actuators. Typical signs include a door or range that will not move, or a click with no motion. Confirm the command signal before replacing the actuator — a failed module looks the same. Read more

This group shows a single part: DORMAN 667845.

This table covers the Valve covers. Read more

One part is listed for the 2021 BMW 420I — SKP SK743462.

This table covers the gaskets that seal the valve cover to the cylinder head. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

This group shows a single part: AJUSA 11140100.

This table covers the lifters / tappets that transfer cam motion to the valves. Read more

This group shows a single part: AJUSA 85022300.

This table covers the seals on each valve stem that control oil into the guides. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

3 Valve Stem Seal parts for the 2021 BMW 420I come from AJUSA.

Listed part numbers: AJUSA 57067700, AJUSA 12027900 and AJUSA 12028200.