ACDelco Oil Filter Lookup: Verify PF and GM Part Numbers
Use current GM and ACDelco information to identify an oil filter, reconcile PF and GM numbers, and resolve old labels or catalogue conflicts before buying.
Spark Plugs
Are All Spark Plugs the Same Size? Dimensions That Matter
Separate spark-plug thread size, reach, seat, hex and projection. See real DENSO examples and learn why matching dimensions alone does not prove engine fitment.
Are Iridium Spark Plugs Radioactive? Metal vs. Iridium-192
Ordinary iridium spark plugs are not radioactive sources. Understand stable iridium, Ir-192, ignition interference and the practical checks that matter.
Can Bad Spark Plugs Cause Slow Acceleration? What to Check
Bad plugs can cause hesitation, but slow acceleration has other causes. Learn which observations, service records and diagnostic findings help separate them.
Can Bad Spark Plugs Cause White Smoke? Check the Evidence
White exhaust is not a reliable spark-plug diagnosis. Separate condensation, coolant-related symptoms and misfires before choosing a repair.
Can Spark Plugs Go Bad From Sitting? Storage and Restart Checks
Separate boxed spark-plug storage from a parked car’s starting problems. Check condition, prior wear and handling without relying on an invented expiry date.
Can You Change Spark Plugs When the Engine Is Hot?
Let the engine cool before routine spark-plug service. Understand why temperature matters, how to plan the job and when a stuck plug needs expert help.
Do Fuel-Injected Cars Have Spark Plugs? Gas vs. Diesel
Fuel injection meters fuel; it does not replace ignition. Learn why injected gasoline engines use spark plugs, how diesels differ, and what hybrids retain.
Do New Spark Plugs Need to Be Gapped? Check Before Adjusting
Learn when new spark plugs need a gap check, why NGK and DENSO instructions differ, and when a factory-set fine-wire plug should be left unadjusted.
Do Racing Spark Plugs Help? Benefits, Limits and Fitment
Racing spark plugs can suit modified engines, but do not guarantee more power. Compare heat range, fitment and ignition needs before changing a road-car plug.
Do Spark Plugs Affect Fuel Economy? Check the Cause First
Understand how worn spark plugs can affect fuel use, measure MPG changes fairly, and separate needed maintenance from unsupported fuel-saving claims.
Do Spark Plugs Increase Horsepower? Read the Evidence
Learn when new spark plugs restore power, what a horsepower claim actually compares, and which evidence matters before paying for a performance upgrade.
Does Fuel Injector Cleaner Clean Spark Plugs?
Some fuel additives claim spark-plug deposit cleaning. Learn what those claims cover, what a cleaner cannot repair, and when diagnosis comes first.