FRAM PH3980 vs Mobil 1 (ExxonMobil / Mann+Hummel) M1-101A: Oil Filter Compatibility

Compare FRAM PH3980 and Mobil 1 (ExxonMobil / Mann+Hummel) M1-101A oil filters by compatibility, dimensions, thread size, gasket fit, bypass valve, anti-drainback valve status, and match confidence. Use this comparison as a fitment review, not as an automatic substitution guarantee. Both use a M18x1.5 thread.

Quick verdict

RISKY

Both use a M18x1.5 thread.

Thread size is the first hard-fit check for any comparison of spin-on filters.
Gasket OD and gasket ID are the most important seal-related dimensions.
Height differences can matter for clearance even when thread and gasket fit appear close.
Bypass and anti-drainback differences may be important, depending on the application.

FRAM PH3980 and Mobil 1 (ExxonMobil / Mann+Hummel) M1-101A specifications

How matching is scored

Specification	FRAM PH3980 View on Amazon	Mobil 1 (ExxonMobil / Mann+Hummel) M1-101A View on Amazon
Thread size	M18X1,5	M18x1.5
Gasket OD	71.1 mm	70 mm
Gasket ID	62.5 mm	62 mm
Can OD	75.79 mm	74.19 mm
Height	125.43 mm	87.63 mm
Internal bypass valve	No	Yes
Bypass PSID	Not applicable	8 - 11
Anti-drainback valve	Yes	Yes

What matters in this specific comparison

Thread size matches: both are M18x1.5.

Gasket OD differs by 1.1 mm (FRAM PH3980: 71.1 mm, Mobil 1 (ExxonMobil / Mann+Hummel) M1-101A: 70 mm).

Gasket ID differs by 0.5 mm (FRAM PH3980: 62.5 mm, Mobil 1 (ExxonMobil / Mann+Hummel) M1-101A: 62 mm).

FRAM PH3980 is 37.8 mm taller (FRAM PH3980: 125.43 mm, Mobil 1 (ExxonMobil / Mann+Hummel) M1-101A: 87.63 mm) -- check clearance before substituting.

Can OD differs by 1.6 mm (FRAM PH3980: 75.79 mm, Mobil 1 (ExxonMobil / Mann+Hummel) M1-101A: 74.19 mm).

Bypass valve presence differs: Mobil 1 (ExxonMobil / Mann+Hummel) M1-101A has one, FRAM PH3980 does not.

Open related filters

Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.