What is the difference between the red and blue oil used on a filter?

What’s the Difference Between Red and Blue Filter Oil?

S&B offers two different oil colors for our cotton air filters — red and blue. While the color may look different, the oil itself is identical in performance, viscosity, and protective properties. The only difference is the dye added for product identification.

Red Oil: For S&B Branded Filters

All S&B oiled filters use red oil. The red color helps verify even coverage during the re-oiling process and visually distinguishes our filters from replacement models made for other brands.

You can browse our full selection of genuine S&B filters here:
View S&B Oiled Filters 

Blue Oil: For Other-Brand Replacement Filters

Filters designed to replace other brand intakes use blue oil. This makes it easy to tell them apart from S&B’s red-oiled filters. Despite the color difference, both oils deliver the same superior filtration and airflow performance.

Shop our blue-oiled replacement filters here:
View Replacement Filters for Other Brands 

Key Takeaway

The red and blue oils are chemically identical. Both provide the same high-quality protection for your engine — the color is simply a visual identifier to distinguish S&B filters from other-brand replacement filters.