Would this work for the front suspension an a trek marlin 5?

Yes it works fine., but you can go to local MB shop and buy oil with same values cheaper.

Is this a good weight for the front of my trx4?

Is it recommended for it… no, it is recommended for use in bike front suspension forks, however I was looking at it for the same purpose. Rc use. Im gonna run it. Cheaper than rc brands by volume.

If I have air forks, do I need suspension fluid?

Yes, you absolutely need suspension fluid. An "air fork" has a sealed air chamber which functions as a "spring". When you the fork down, the air chamber compresses further and pushes back. It's pretty simple. This air chamber has rubber seals which use oil to lubricate the seals and prevent air from leaking. Also, there is typically a "damper" side to the folk (side of the fork which has adjustments for rebound, compression, etc.) which also requires oil. The charge damper should generally be left alone. It requires patience and finesse to properly change and bleed the oil. It would probably be worth taking your bike into a shop to have this done. Scratches to your fork could ruin it. It'd be cheaper to pay for service than pay for a new fork.

Need Help Guys, when I add the oil should how should my rebound and dampening be set??

I have RockShox Recon 2006. It did not matter how it was set when adding oil. There was no pressure. The dampener was a pain to get back together because of the oil needing to work it’s way around seals and such. But after quite a bit of twisting it got back into place. Adding oil to the lower chambers was simply adding oil to two tubes. No settings really mattered then either.

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RockShox Suspension Oil, 15wt, 120ml Bottle, Lower Legs | RockShox 15wt Suspension Oil - Synthetic Hydraulic Fluid for Forks & Shocks

Product ID: 1429772

Details

Brand
RockShox
Liquid Volume
120 ml
Material
Multi
Package Information
Bottle
Recommended Uses For Product
Suspension Oil

🔧100% RockShox compatibility

⚙️15wt viscosity for precise damping

🛢️120ml bottle for multiple services

$25.20

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Description

⚡ Elevate your ride with RockShox’s precision suspension oil — because every drop counts!

GENEROUS 120 ML VOLUME - Ample oil quantity for multiple maintenance sessions without frequent repurchases.
EFFORTLESS MAINTENANCE - Simplifies suspension servicing with perfect compatibility and easy application.
ROCK SHOX CERTIFIED FORMULA - Engineered specifically for RockShox forks and shocks to maintain peak performance.
VISCOSITY STABILITY TECHNOLOGY - Innovative formula resists breakdown, delivering consistent damping ride after ride.
PRECISION TUNED SUSPENSION FLUID - Optimized 15wt viscosity ensures smooth, responsive fork and shock performance.

RockShox Suspension Oil 15wt in a 120ml bottle is a premium, viscosity-stable fluid designed exclusively for RockShox forks and shocks. Trusted by professionals and enthusiasts alike, it ensures optimal damping performance and easy maintenance, making it the go-to choice for riders demanding smooth, reliable suspension tuning.

Specifications

ASIN	B005543YIQ
Best Sellers Rank	#46,515 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #43 in Bike Tool Kits
Brand	RockShox
Brand Name	RockShox
Container Type	Bottle
Customer Reviews	4.7 out of 5 stars 1,265 Reviews
Global Trade Identification Number	00710845655197
Included Components	Suspension Oil and Lube
Item Form	Oil
Liquid Volume	120 ml
Manufacturer	RockShox
Material	Multi
Model Number	11.4315.021.040
Number of Items	1
Number of Packs	1
Package Information	Bottle
Part Number	PS4315021040
Recommended Uses For Product	Suspension Oil
SAE J300 Viscosity Grade	15W
Specific Uses For Product	Suspension Oil and Lube
UPC	744288815450 710845655197
Unit Count	1 Count
Warranty Description	Limited Warranty

Reviews

T**.

Nice

Good shock oil

7.07.2026

J**.

For suspension adjustments

Research suspension manufacturers recommend fluid

24.06.2026

M**E

Made my fork work like new

I used this oil on an old rock shop fork rebuild, made it work like new, very pleased

5.03.2024

A**Y

Save me a lot money

I used it to fix my bike suspension problem, it’s worked. Good value for the size. No need go to bike shop and spend 200 dollars, save me lot money

3.10.2025

M**N

👍 great oil🛢 for fork suspension

👍 great oil for fork suspension Roch shox products are excellent. Recommended 100%

3.04.2025

N**C

Producto requerido para Suspensiones

Obligatorio tener este producto si eres de los que realiza sus propios mantenimientos a sus bicicletas. Requerido para suspensiones RockShox, fácil de usar muy buen producto, usar la cantidad recomendada de acuerdo con la suspension.

28.04.2024

A**N

worked great

great sram product

31.05.2024

M**Y

Buen precio

Excelente

19.01.2025

P**C

Livraison trop long

Bon produit

9.12.2020

F**A

Packing

The packing not very great as box quite big for a small item...bubble wipe and inside carton box very loose...I touch the bottle a bit of oil leak dual of poor packing causing....For my country this type packing is not acceptable....lousy or so call lazy pack..

22.08.2024

ナ**ツ

問題なく使えます

特にししょなく使えてます

6.12.2025

G**S

Recomendo

Rápida entrega e produto corresponde ao pedido.

19.03.2026

P**Y

Rockshox oil

Awesome

31.05.2023

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TrustScore 4.5 | 7,300+ reviews

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The product exactly matches the description. Very satisfied with my purchase.

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1 month ago

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$25.20

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Perfect platform for hard-to-find items. Delivery was prompt.

1 month ago

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