I've been using the Purolator Pure One filter in my Ecotec.
However, this issue came up on the Cobalt message board that I sometimes frequent; several people there claimed the warranty would be compromised if an aftermarker filter was used. I reasoned that IF this were true, Jiffy Lube and all the quick lubes out there using aftermarket filters would have gone out of business long ago after the lawsuits they would have received had people's warranties been eliminated. Finally, some guy posted the following TSB:
Keep in mind that the issue in question is improper filter installation, possibly aggravated by use of aftermarket (ie, poor quality) filters. I'd say that if you stick to known filter brands (like my Pure One mentioned earlier) and remember to properly lube the little O-ring on the filter nipple, there should be no problem.
Subject: Information on Internal Engine Noise or Damage After Oil Filter Replacement #07-06-01-016A - (09/17/2007)
Models: 2008 and Prior Passenger Cars and Trucks (Including Saturn and Saab)
2008 and Prior HUMMER H2, H3
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This bulletin is being updated to include additional information on incorrect or improperly installed engine oil filters. Please discard Corporate Bulletin Number 07-06-01-016 (Section 06 -- Engine/Propulsion System).
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Important: Engine damage that is the result of an incorrect or improperly installed engine oil filter is not a warrantable claim. The best way to avoid oil filter quality concerns is to purchase ACDelco® oil filters directly from GMSPO.
Oil filter misapplication may cause abnormal engine noise or internal damage. Always utilize the most recent parts information to ensure the correct part number filter is installed when replacing oil filters. Do not rely on physical dimensions alone. Counterfeit copies of name brand parts have been discovered in some aftermarket parts systems. Always ensure the parts you install are from a trusted source. Improper oil filter installation may result in catastrophic engine damage.
Refer to the appropriate Service Information (SI) installation instructions when replacing any oil filter and pay particular attention to procedures for proper cartridge filter element alignment. If the diagnostics in SI (Engine Mechanical) lead to the oil filter as the cause of the internal engine noise or damage, dealers should submit a field product report. Refer to Corporate Bulletin Number 02-00-89-002F (Information for Dealers on How to Submit a Field Product Report).
ALSO check this out
Subject: Low Oil Pressure - Inspect Oil Filter For Damage - keywords adjuster after change engine hot idle indicator lamp lash lifter light LOF mechanical no noise rattle tick #PIP3859A - (07/10/2007)
Models: 2002-2005 Chevrolet Cavalier
2005-2008 Chevrolet Cobalt, Cobalt SS
2006-2008 Chevrolet HHR
2004-2008 Chevrolet Malibu
2004-2005 Chevrolet Malibu Classic
2002-2004 Oldsmobile Alero
2007-2008 Pontiac G5
2006-2008 Pontiac G6
2002-2005 Pontiac Grand Am, Sunfire
2005-2006 Pontiac Pursuit (Canada Only)
2006-2008 Pontiac Solstice
2007-2008 Pontiac Solstice GXP
2007-2008 Saturn Aura, Aura Hybrid
2003-2007 Saturn Ion
2004-2007 Saturn Ion Redline
2001-2005 Saturn L Series
2007-2008 Saturn Sky, Sky Redline
2002-2008 Saturn Vue
2007-2008 Saturn Vue Hybrid
with any of the following engines:
2.0L Engine (VIN P - RPO LSJ)
2.0L Engine (VIN X - RPO LNF)
2.2L Engine (VIN D or F - RPO L61)
2.4L Engine (VIN B or P - RPO LE5)
2.4L Engine (VIN 5 or Z - RPO LAT)
2003-2008 Saab 9-3 Sedan
2004-2008 Saab 9-3 Convertible
2006-2008 Saab 9-3 Combi