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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⚙️ Elevate your ride with RockShox precision – because your suspension deserves the best!

UNISEX UNIVERSAL - Ideal for all adult riders seeking premium suspension care and performance.
OPTIMAL VOLUME CONTROL - 120ml bottle size designed for precise maintenance without waste.
PERFECT FIT FOR ROCK SHOX - Formulated exclusively for all RockShox suspension components for guaranteed compatibility.
PRO RECOMMENDED MAINTENANCE - Follow RockShox technical manuals to maximize suspension lifespan and ride quality.
PRECISION TUNED SUSPENSION OIL - 15 weight viscosity ensures smooth, responsive fork and shock performance.

RockShox Suspension Oil 15wt in a 120ml bottle is engineered specifically for RockShox forks and shocks, providing optimal damping performance. This premium oil matches the recommended viscosity for smooth suspension operation, ensuring professional-grade maintenance and enhanced ride quality for serious cyclists.

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Material	Oil
Brand	RockShox
Package Information	Bottle
Liquid Volume	120 Milliliters
Recommended Uses For Product	Suspension Oil
Specific Uses For Product	Suspension Oil
Item Form	Oil
Global Trade Identification Number	00710845655197
Manufacturer	RockShox
Unit Count	4.05 Fluid Ounces
UPC	744288815450 710845655197
Item Package Dimensions L x W x H	4.06 x 1.69 x 1.61 inches
Package Weight	0.09 Kilograms
Item Dimensions LxWxH	1.57 x 2.76 x 3.94 inches
Brand Name	RockShox
Color	Grey
Suggested Users	unisex-adult
Part Number	PS4315021040
Model Year	2014
Size	120Ml

RockShox Suspension Oil 15wt 120ml Bottle Lower Legs

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