J33DMB
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Spark Plug Install Instructions
J33DMB replied to BoxerGT2.5's topic in Walkthroughs :: Basic Operation & Maintenance
What would happen if platinum plugs were installed instead of iridium? I just had my 60,000 mile work done at a local mechanic who seems very competent and is into Subaru's and I'm pretty sure he said he installed double platinum. Also, what effect do spark plugs have on fuel efficiency?
