Parts for your 2010 Lexus Is-Strut mounts

2010 Lexus IS strut mounts — are they actually used?

According to the Lexus IS (XE20) 2010 Repair Manual within Lexus TIS and the Toyota Electronic Parts Catalogue, the 2010 Lexus IS (including IS 250/350 and IS F) runs a double wishbone front suspension and a multi-link rear — not a MacPherson strut setup. Because a MacPherson strut isn’t used, a traditional “strut mount” with an integrated steering bearing isn’t fitted. Instead, this model uses shock absorber upper mounts/insulators that locate and isolate the damper and spring under the body. Aftermarket catalogues (KYB, Sachs, Monroe) sometimes list these as “strut mounts” for convenience, but technically they’re shock mounts/insulators rather than true strut tops.

Why the difference matters: on a strut car, the strut mount carries vehicle weight, damps vibration and houses a bearing to let the whole strut rotate as you steer. On the 2010 Lexus IS, steering rotation happens via ball joints and control arms, so the upper mount doesn’t contain a steering bearing and isn’t loaded in the same way. That’s why “strut mounts” as a part category isn’t strictly relevant for this vehicle.

For owners chasing knocks or shimmy, it’s still smart to look at the IS’s shock absorber upper insulators, rubber seats, and dust boots. With age and Kiwi/Oz conditions, the rubber can harden, crack or sag, causing clunks over sharp bumps, a brittle ride, or imprecise road feel. If shocks are being replaced, doing the mounts/insulators at the same time saves labour and keeps things quiet under the bonnet.

• Inspect at regular services (every 20,000–40,000 km) or if there’s knocking, creaking, or harshness.
• Replace in axle pairs and use quality components matched to the IS chassis.
• Check related items: rubber spring seats, dust boots, bump stops and the top nut hardware.
• After any suspension work, have the wheel alignment checked to keep the tyres wearing evenly.
• Always torque fasteners to the Lexus workshop specifications.

Bottom line: while “strut mounts” aren’t a thing on the 2010 Lexus IS in the strict sense, the car does rely on upper shock mounts/insulators to keep the ride quiet and composed. Getting those pieces right makes a noticeable difference to everyday comfort and steering feel.

Does the 2010 Lexus IS have strut mounts?

No. Technical sources (Lexus TIS repair manual and Toyota EPC) show a double wishbone front and multi-link rear, so it uses shock absorber upper mounts/insulators rather than true strut mounts with a steering bearing. Some aftermarket listings use “strut mount” as a generic term, but the function is different on this chassis.

What should be replaced when changing shocks on a 2010 Lexus IS?

It’s wise to renew the upper shock insulators/mounts, rubber spring seats, dust boots and bump stops at the same time. Replace in pairs, follow Lexus torque specs, and book a wheel alignment afterwards to protect your tyres and handling.

How often should the upper shock mounts/insulators be checked?

Have them inspected during routine services, typically every 20,000–40,000 kilometres, or sooner if you notice knocking over bumps, increased cabin vibration, or a harsher ride. Age, heat and rough roads can perishing the rubber over time.