One question leads to another question.
Scanning through my options on amazon I see these cartridge filters recommended for my new Prius:
$7 Purolator classic (approximately)
$21 Mobil 1
$23 Amsoil EaO
The spin-on equivalents for my Honda I4 are $3.50, $11, and $15..... about 50-60% as costly. I thought the cartridge filters would be less (no metal housing, no bypass filter, no antidrain valve). What's up with the higher cost?

$7 Purolator classic (approximately)
$21 Mobil 1
$23 Amsoil EaO
The spin-on equivalents for my Honda I4 are $3.50, $11, and $15..... about 50-60% as costly. I thought the cartridge filters would be less (no metal housing, no bypass filter, no antidrain valve). What's up with the higher cost?
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