Baldwin BT7349 Heavy-Duty Spin-On Oil Filter | 1-16 Thread

Baldwin BT7349 Heavy-Duty Spin-On Oil Filter — 1-16 Thread

Overview

The Baldwin BT7349 is a heavy-duty tall-canister spin-on oil filter for diesel engine applications, using cellulose media rated at 12 micron nominal / 30 micron absolute on a 1"-16 mounting thread. It cross-references directly to Fleetguard LF3972 and Cummins 4920070, and is also listed for selected Cummins QSB-family marine diesel applications and 5.9 L / 6.7 L turbo-diesel platforms. The taller 7-1/8 in. canister is a key fitment identifier — do not substitute a shorter 1"-16 filter based on thread alone, as filters with the same thread can have different heights, bypass settings, and media specifications. Always confirm using the existing OEM filter number.

Compatible Applications

• Cummins diesel engines cross-referencing Cummins 4920070 or Fleetguard LF3972
• Selected Cummins QSB-family marine diesel applications
• Cummins 5.9 L and 6.7 L turbo-diesel engine applications
• Applications cross-referencing Chrysler / Mopar 5083285AA
• Applications cross-referencing Donaldson ELF7349 or WIX 57620
• Applications where Baldwin BT339 is currently fitted — BT7349 is an approved upgrade replacement for BT339 (see FAQ)
• Confirm engine make, model, serial number, and existing OEM filter number before ordering — thread size alone is not sufficient for a tall-canister heavy-duty filter

Dimensions

• Thread: 1"-16
• Outside diameter: 3-11/16 in. / 93.7 mm
• Length: 7-1/8 in. / 181.0 mm
• Filtration: 12 micron nominal / 30 micron absolute
• Media: Cellulose
• Gasket: G381-A (integral, furnished with filter)

Cross-Reference / Alternate Part Numbers

• Baldwin: BT7349
• Fleetguard: LF3972
• Cummins: 4920070
• Donaldson: ELF7349
• WIX: 57620
• NAPA Gold: 7620
• Chrysler / Mopar: 5083285AA
• AMSOIL: EaO80, SDF80, ASF80
• Baldwin (approved substitution): BT7349 may be used in place of BT339 — see note below

Cross-reference numbers are provided as a fitment aid only. Always confirm the original OEM filter number, thread, height, and bypass specification before substituting.

BT7349 vs. BT339 — Important Substitution Note

Baldwin specifically notes that BT7349 may be used in place of BT339, but BT339 cannot be substituted for BT7349. This means BT7349 is an approved upgrade replacement for engines that currently use BT339 — but if your engine specifies BT7349, do not fit the shorter BT339 in its place. If you are unsure which filter your engine requires, confirm using the OEM filter number from the engine service manual or the number on the existing filter.

Service Interval

Replace the BT7349 at every engine oil change or at the interval specified by the engine manufacturer. For Cummins QSB and turbo-diesel applications, consult the Cummins operation and maintenance manual for the specific interval based on oil type, hours of operation, and duty cycle. Replace sooner if:

• Oil contamination, fuel dilution, or coolant intrusion is detected
• Internal engine repairs have been performed
• Oil-analysis results indicate excessive contamination or filter loading
• The filter canister is dented, corroded, or shows signs of leakage
• The engine has operated under sustained high-load or high-temperature conditions

Installation Notes

• Remove the old filter and confirm its G381-A gasket has not remained on the filter head
• Clean the sealing surface on the filter base thoroughly
• Compare the new filter’s thread, gasket, and body length against the removed filter — confirm the 7-1/8 in. height matches the installation clearance
• Lightly coat the new filter’s gasket with clean engine oil
• Install by hand per Baldwin’s tightening specification — do not overtighten
• Refill with the engine manufacturer’s specified oil grade and quantity
• Start the engine and confirm normal oil pressure immediately
• Inspect the filter body and gasket for leaks during the first minutes of operation
• Shut down, allow oil to settle, recheck and correct the oil level

Related Products

• Fleetguard Lube Filter LF3620
• Fleetguard Fuel Filter FF5072
• Fleetguard Fuel Water Separator FS1280
• AMSOIL Oil Filter ASF-25 | 13/16-16 Spin-On
• Baldwin B179 Heavy-Duty Spin-On Oil Filter — 1-16 UN
• Baldwin Oil Filter B1400
• AMSOIL 15W-40 Heavy-Duty Diesel & Marine Oil AME1GC — 3.78 L
• Browse All Oil Filters

Technical FAQ

How do I confirm BT7349 fits my engine?

Locate the filter number on the existing filter or in your engine’s service manual. If it is Cummins 4920070, Fleetguard LF3972, WIX 57620, or Donaldson ELF7349, BT7349 is the correct Baldwin equivalent. Also confirm the 1"-16 thread, 3-11/16 in. diameter, and 7-1/8 in. length match your existing filter before ordering.

Can I use BT7349 if my engine currently has a BT339?

Yes — Baldwin specifically approves BT7349 as a replacement for BT339. However, this is a one-way substitution: BT7349 can replace BT339, but BT339 cannot be substituted for BT7349. If your engine specifies BT7349, do not fit the shorter BT339.

What is the difference between BT7349 and B179?

Both use the same 1"-16 thread family, but they differ in body length, media rating, and application. BT7349 is a 7-1/8 in. tall canister rated at 12 micron nominal, primarily for Cummins diesel applications. B179 is a shorter format at approximately 5.38 in., rated at a different specification. Always confirm using the existing OEM filter number rather than selecting by thread alone.

Is BT7349 suitable for marine diesel applications?

Yes, where the engine specifically calls for the Cummins 4920070 / Fleetguard LF3972 filter family. This includes selected Cummins QSB-series marine diesel engines. Confirm using the OEM filter number from your engine service documentation rather than the engine model name alone.

Do I need synthetic oil to use BT7349?

No — BT7349 uses cellulose media and is compatible with both conventional and synthetic engine oils. Use the oil grade and specification required by your engine manufacturer regardless of the filter brand.

Why does the height of the filter matter?

The 7-1/8 in. tall canister of BT7349 requires adequate clearance in the engine bay. Before ordering, confirm the installation space accommodates this height. A filter that is too tall for the available clearance cannot be installed safely, and using a shorter filter than specified can reduce oil capacity and bypass performance.

Parts Desk Insights

Best use case: BT7349 is the right filter for customers maintaining Cummins diesel engines — particularly QSB-series marine diesels and 5.9/6.7L turbo-diesel platforms — where the existing filter is Cummins 4920070 or Fleetguard LF3972. At $25.84 it is an accessible option against OEM Cummins or Fleetguard pricing. It also comes up when customers are upgrading from the shorter BT339 on engines where Baldwin has approved the BT7349 as the current replacement. The AMSOIL cross-reference (EaO80/ASF80) occasionally brings in customers who are cross-shopping filter brands based on AMSOIL service records.

Common customer questions: The most frequent issue is customers ordering a 1"-16 thread filter without checking height — the 7-1/8 in. tall canister is a specific dimension that must be confirmed against installation clearance. Always ask for the existing filter number or OEM cross-reference before completing the order. The second common question is the BT339 substitution direction — customers who currently have a BT339 on their engine sometimes ask whether they can use BT7349. The answer is yes, Baldwin approves that upgrade. The reverse is not permitted.