Originally Posted by Fredoops Penrite Racing/HPR5/Premium 0 are what I've been using also Valvoline Synpower (5w40), Nulon I've heard were good too. were they iridium or copper? should be iridium I got walker off amazon. Sweet thanks will look at purchasing Penrite Racing HPR5 from supercheap or autobarn or repco this weekend whichever one is cheaper. They're iridium plugs. Do you know the part no for the walker oxygen sensor?
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