Great to see an informative, thorough answer made simple and unbiased, advising the benefits of both types. Often people just give a one word answer with no substance to support the claim =)If you don't mind changing your plugs every 15,000 miles or so go with the BKR7E vPower copper plugs. If you don't want to change the plugs as often then go with the NGK BKR8EIX iridium plugs. The copper plugs are cheaper per mile and perform better at low RPM but don't last as long.
Don't assume there is no bias in any answer you get on any forum.Great to see an informative, thorough answer made simple and unbiased, advising the benefits of both types. Often people just give a one word answer with no substance to support the claim =)
OEM are iridium tip with platinum ground strap. Hence why they are long life and run terribly at low RPM.Do NOT put platinum plugs in a 1st Generation Cruze. The OEM plugs are iridium. My recommendation to OP was based on 100,000 miles driving my ECO MT on a combination of
OEM plugs (NGK IFR 7 series Iridium plugs - I don't know the exact model number)
NGK BKR7E vPower 4644
NGK BKR7EIX Iridium plugs
NGK BKR8EIX Iridium plugs
My assessment is that the BKR8EIX and BKR7E-4644 plugs perform almost the same. The problem is the 8EIX plugs only last about twice as long and cost three times as much. The BKR7EIX plugs are better than the OEM plugs but not as good as the 8EIX and BKR7E plugs. Thus my recommendation to go with the BKR7E if you don't mind checking your plugs every other oil change.
My recommendation, while potentially biased, was based on my own experiences with my 2012 Cruze ECO Manual.