This page contains affiliate links. If you buy through them, we may earn a commission at no extra cost to you.
Coastal Picks
BOSCH 5520WS Workshop Engine Air Filter review
A high-pleat-count engine air filter rated for 98% filtration efficiency, built as a direct OEM replacement.
Quick take
Bosch Workshop engine air filters use a high pleat count for robust particle-holding capacity, rated at 98% filtration efficiency against small particles that cause engine wear. High-velocity cellulose cured media keeps air resistance low while maintaining even pleat spacing, and a polyurethane foam seal provides elasticity and protects against water and heat intrusion. This specific filter (OEM part 5520WS) fits select Lexus and Toyota models — always verify fitment against your specific vehicle before ordering.
From our own use
Buying and installing your own engine air filter can save money at an oil change. I usually install mine myself, but even bringing the correct replacement filter to a service appointment can help avoid a marked-up price.
| Brand | Bosch |
| OEM part number | 5520WS |
| Filtration efficiency | 98% |
| Fit type | Vehicle specific |
| Dimensions | 10.86"L x 9.58"W x 5.49"H |
| Compatible vehicles | Select Lexus and Toyota models, 2006-2016 range |
Who it's for
Good fit
- DIY car owners comfortable replacing their own engine air filter
- Anyone wanting to bring their own filter to a service appointment to avoid markup
- Owners of compatible Lexus or Toyota models
Skip it if
- Your vehicle isn't on the compatible list — always verify exact fitment before ordering
Installation and daily use
A high pleat count directly increases the surface area available to trap particles before airflow resistance builds up, which is the mechanical reason this filter is rated for strong holding capacity rather than needing frequent replacement. The polyurethane foam seal is a detail that matters specifically for keeping water and heat from bypassing the filter media at the edges, which is a common failure point in cheaper filters.
Pros and cons
Pros
- 98% filtration efficiency
- High pleat count for extended holding capacity
- Direct OEM part number fitment
- Foam seal protects against water and heat intrusion
Cons
- Vehicle-specific — must verify fitment before purchase
- DIY installation requires some basic comfort under the hood
Frequently asked questions
What's the filtration efficiency?
98%, rated for removing small particles from incoming air.
Will this fit my car?
It's fit for select Lexus and Toyota models — always verify fitment against your specific vehicle and year before ordering.
Can I install this myself?
Yes, engine air filters are a common DIY replacement for most vehicles.
What OEM part number does this replace?
5520WS.