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.

ASIN	B005543YIQ
Best Sellers Rank	#65,312 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #61 in Bike Tool Kits
Brand	RockShox
Brand Name	RockShox
Color	Grey
Customer Reviews	4.7 4.7 out of 5 stars (1,222)
Date First Available	February 11, 2011
Global Trade Identification Number	00710845655197
Included Components	Suspension Oil and Lube
Item Dimensions LxWxH	1.57 x 2.76 x 3.94 inches
Item Form	Oil
Item Package Dimensions L x W x H	3.82 x 1.65 x 1.61 inches
Liquid Volume	120 Fluid Ounces
Manufacturer	RockShox
Material	Multi
Model Name	LU6530
Model Year	2014
Number of Items	1
Package Information	Pail
Package Weight	0.11 Kilograms
Part Number	PS4315021040
Recommended Uses For Product	Suspension Oil
SAE J300 Viscosity Grade	15W
Size	120Ml
Specific Uses For Product	Suspension Oil and Lube
Style	Suspension Oil and Lube
Suggested Users	unisex-adult
UPC	744288815450 710845655197
Unit Count	120 Milliliters
Warranty Description	Limited Warranty

Suspension Oil 15wt 120ml Bottle

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Common Questions