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I'd replace them at the 30k interval - the stock plugs are 'standard' NGK plugs -
You could go with Laser Platinum NGK's for the 5.7 (#PLZFR5B13EG) - it would mainly help keep the gap from increasing due to erosion during normal wear.
The SRT8 6.1 uses a different spec OEM plug with a longer service interval of 100k changes.
Chrysler may have gone with a less expensive 5.7 plug for lower operating costs...?
2016 392 Hemi Scat Pack Shaker 23Y pkg (6 speed MT) ordered 8/28/15, born 10/23/15, home 11/20/15
Torred / Black/ Ruby Red leather
2009 R/T 27J pkg (6 speed MT) ordered 7/17/08, born 10/23/08, home 11/13/08
Hemi Orange / Dark Slate/Light Slate Gray leather
Last edited by Hal H; 10-12-2010 at 11:46 AM.