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

Product ID: 254940229

Details

Brand
RockShox
Liquid volume
120
Material
Andere
Package information
Bottle
Recommended uses for product
Draussen

⚙️15wt viscosity for optimal damping

🛢️120ml precision bottle

🚴‍♂️Engineered for RockShox forks & shocks

HK$233

Duties & taxes included

In stock

Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚙️ Elevate your ride with precision suspension oil — because every drop counts!

TRUSTED BY PROS - 4.7-star rating from over 1,200 riders who demand reliability and performance.
CORROSION DEFENSE - Advanced synthetic formula protects internal components from wear and rust, extending suspension life.
ROCK SHOX CERTIFIED - Formulated specifically for RockShox forks and rear shocks to maintain peak responsiveness.
COMPACT CONVENIENT - 120ml bottle designed for easy application and perfect dosing on the trail or at home.
PRECISION TUNED VISCOSITY - 15wt synthetic oil ensures smooth, consistent suspension performance under all conditions.

RockShox Suspension Oil 15wt is a synthetic hydraulic fluid specially formulated for RockShox forks and rear shocks. Packaged in a 120ml bottle, it delivers optimal damping performance, corrosion protection, and long-lasting reliability, making it a must-have for serious cyclists seeking smooth, responsive suspension.

Specifications

ASIN	B005543YIQ
Best Sellers Rank	#120,432 in Sporting Goods ( See Top 100 in Sporting Goods ) #121 in Bike Lube
Brand Name	RockShox
Container Type	Bottle
Customer Reviews	4.7 4.7 out of 5 stars (1,244)
Global Trade Identification Number	00710845655197
Included Components	Suspension Oil and Lube
Item Form	Oil
Item Highlight	RockShox 15wt Suspension Oil - Synthetic Hydraulic Fluid for Forks & Shocks
Liquid Volume	120 Milliliters
Manufacturer	RockShox
Material	Andere
Model Number	11.4315.021.040
Number of Items	1
Number of Packs	1
Part Number	PS4315021040
Recommended Uses For Product	Draussen
SAE J300 Viscosity Grade	15W
Specific Uses For Product	Prevent Corrosion
UPC	744288815450 710845655197
Unit Count	120 Milliliters
Viscosity	15

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