	Name	Purchased for ($)	Link	Made In
	Purolator	$25.00	Search on Amazon	Mexico
Project Farm's overall winner and preferred choice, combining the best large-particle filtration result with better-than-average airflow.
	MOTOALL	$13.00	Search on Amazon	China
Second overall. Excellent airflow and dirt-loaded airflow retention, but weaker contaminant filtration.
	PHILTOP	$14.00	Search on Amazon	China
Three-stage progressive-density filter with strong initial airflow and middle-of-the-pack dust filtration.
	KAX	$18.00	Search on Amazon	China
Good airflow retention after dust loading, but relatively weak dust filtration in the particle test.
	Bosch	$10.00	Search on Amazon	China
Lowest-priced filter tested. Project Farm's value pick; strong dust filtration with more airflow restriction than the performance-focused filters.
	K&N Washable	$55.00	Search on Amazon	USA
Highest-airflow filter tested and best at retaining airflow after dust loading, but it allowed the most dust through the filtration test.
	Spearhead Max Thrust	$16.00	Search on Amazon	China
Maintained airflow fairly well after dust exposure, but allowed a relatively high number of dust particles through.
	A-Premium	$14.00	Search on Amazon	China
Three-layer filter with good initial airflow but below-leading filtration performance.
	DNA Motoring Washable	$22.00	Search on Amazon	China
High-flow washable filter. Excellent airflow, but a large amount of dust passed through in the filtration test.
	Wix	$14.00	Search on Amazon	Mexico
Strong large-particle filtration, but relatively restrictive when new and after heavy dust loading.
	FRAM	$19.00	Search on Amazon	Mexico
Average initial airflow, but one of the weakest performers in the dust-particle test.
	ECOGARD	$14.00	Search on Amazon	Malaysia
Good dust blocking performance, but high airflow restriction, especially after heavy dust exposure.
	K&N Disposable	$18.00	Search on Amazon	China
Disposable K&N filter with moderate airflow and relatively high particle penetration during the dust test.
	ACDelco	$31.00	Search on Amazon	USA
OEM-style GM filter with good dust protection but the lowest initial airflow and the lowest post-dust airflow of the filters tested.
	EPAuto	$15.00	Search on Amazon	China
High pleat count, but below-average initial airflow and substantial restriction after dust loading.

Rank	Product	Result
1	K&N Washable	3.33
2	DNA Motoring Washable	2.91
3	Bosch	2.57
4	ACDelco	2.16
5	Purolator	2.13
6	MOTOALL	2.06
7	Wix	1.98
8	FRAM	1.86
9	EPAuto	1.84
10	KAX	1.78
11	K&N Disposable	1.69
12	Spearhead Max Thrust	1.67
13	PHILTOP	1.63
14	ECOGARD	1.61
15	A-Premium	1.58

Rank	Product	Result
1	No Filter (Control)	0.13
2	K&N Washable	0.39
3	DNA Motoring Washable	0.40
4	MOTOALL	0.49
5	PHILTOP	0.52
6	Bosch	0.53
7	Spearhead Max Thrust	0.54
8	KAX	0.55
9	A-Premium	0.56
10	FRAM	0.56
11	Purolator	0.56
12	K&N Disposable	0.60
13	ECOGARD	0.62
14	EPAuto	0.62
15	Wix	0.66
16	ACDelco	0.66

Rank	Product	Result
1	Bosch	51000
2	MOTOALL	57000
3	PHILTOP	58000
4	Wix	60000
5	EPAuto	60000
6	ECOGARD	64000
7	A-Premium	65000
8	Spearhead Max Thrust	65000
9	No Filter (Control)	66438
10	KAX	66734
11	DNA Motoring Washable	76000
12	K&N Disposable	78500
13	FRAM	80000
14	Purolator	81000
15	ACDelco	83000
16	K&N Washable	103000

Rank	Product	Result
1	Purolator	758000
2	Wix	1004000
3	Bosch	1008000
4	ACDelco	1048000
5	ECOGARD	1147000
6	PHILTOP	1281000
7	A-Premium	1433000
8	MOTOALL	1630000
9	KAX	1668000
10	Spearhead Max Thrust	1690000
11	EPAuto	1825000
12	K&N Disposable	2085000
13	DNA Motoring Washable	2151000
14	FRAM	2400000
15	K&N Washable	2462000

Rank	Product	Result
1	K&N Washable	0.46
2	MOTOALL	0.55
3	Bosch	0.58
4	PHILTOP	0.58
5	DNA Motoring Washable	0.58
6	A-Premium	0.60
7	Spearhead Max Thrust	0.60
8	KAX	0.60
9	FRAM	0.60
10	Purolator	0.61
11	K&N Disposable	0.64
12	EPAuto	0.67
13	ECOGARD	0.70
14	Wix	0.73
15	ACDelco	0.73

Rank	Product	Result
1	MOTOALL	30.94
2	EPAuto	26.56
3	PHILTOP	25.31
4	A-Premium	25.31
5	ECOGARD	25.31
6	K&N Disposable	25.31
7	Purolator	25
8	KAX	25
9	Wix	23.44
10	FRAM	23.44
11	Bosch	23.13
12	Spearhead Max Thrust	23.13
13	ACDelco	22.50
14	K&N Washable	4.45
15	DNA Motoring Washable	3.81

Best Engine Air Filter: 15 Brands Tested for Airflow and Dust Filtration

Top Picks

Price

Filter Pleat Count

Filter Media Thickness (mm)

Filter Weight (g)

Initial Static Pressure (in. H2O)

Initial Airflow (CFM)

Filtered Shop Air After 30 Seconds (Total Particles)

Total Particles After 1/2 tsp Dust Test

5- and 10-Micron Large Dust Particle Increase

Static Pressure After Heavy Dust Exposure (in. H2O)

Airflow After Heavy Dust Exposure (CFM)

Airflow Loss After Heavy Dust Exposure (CFM)

Measured Filter Media Length (ft)

The Verdict

Related Tests

Top Picks

Price

Filter Pleat Count

Filter Media Thickness (mm)

Filter Weight (g)

Initial Static Pressure (in. H2O)

Initial Airflow (CFM)

Filtered Shop Air After 30 Seconds (Total Particles)

Total Particles After 1/2 tsp Dust Test

5- and 10-Micron Large Dust Particle Increase

Static Pressure After Heavy Dust Exposure (in. H2O)

Airflow After Heavy Dust Exposure (CFM)

Airflow Loss After Heavy Dust Exposure (CFM)

Measured Filter Media Length (ft)

The Verdict