Motorcraft spark plugs sp524
Okay, so I go to O'Reilly's and have them order the sp487 plugs. Come back and they give me the sp478. Return them and try and order the sp487, but the guy says that they have been replaced with the sp524. The sp487 has a .50 gap and the sp524 has a .51 gap. Can I safely use the sp524 platinum plug? Anyone know if this change is style number is correct? The sp487's part number is ayfs092fec while the sp524's part number is ayfs092fe1. I just don't want to cause any damage to the engine. Also, can you tell me the length that the plug should be?