Oil Filters Online Stocks FRAM Oil Filters, Air Filters, Fuel Filters and Autolite Spark Plugs. OilFiltersOnline.com promo code are hard to find. They have some though. The most common for them 10% coupon code. They have 15% off sometimes though. Keep visiting our site for new OilFiltersOnline.com discount codes. Largest inventory, save time & money, simple oil filter, air filter, fuel filter, spark plug finder, lowest price.