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if your engine is in good condition, 87 octane is fine. my friend with a freshly rebuilt sohc is beating the crap out it, and no problems.
if it's old however, you probably have quite a bit of carbon deposits on your pistons, but usually not enough to change your compression ratio that much.
and your engine problems are not related to your switching of octanes. it's all in your mind. your engine's fucking up for other reasons
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