It's not economical to buy two. Most of them start at $40 and go up from there.
Being that it's a "lifetime filter" I really don't see a downside. The SL1 has 99k miles, I plan to put at least 60-70k on it before I sell it, which at my rate, will be about 8 years.
This all has me thinking. I could basically make the SL1 a "maintenance free" vehicle. Amsoil lube everywhere, K&N air filter, go ahead and put new brake pads on it, it has new tires and the struts are newer... If I did all that, I shouldn't have to worry much about the car for a looooooong time. Heck, even if I just put full synthetic oil in it and planned to change the oil every 8-10k miles that is a 1 year oil change interval.
Looks like I'm headed to saturnfans.com to ask a few questions.
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John
'09 Saturn Aura 2.4L
'94 Chevy Camaro Z28 (5.7L 6sp)
'96 Chevy C1500 (5.0L 5sp)
'08 Kawasaki Vulcan 900 Custom
'01 KTM Duke 2