Based on reviews.

Hudy Customized bags now available for pre-orders!

We're using cookies to serve you better - Read more
Shipping to over 180 countries
Online since 2010
100% Satisfaction Guaranteed

How To: Shock absorber basics and oil change

You know it’s time to change the oils in your shocks when you notice there isn’t enough oil or when you’re making changes to the damping setup or when the shocks are damaged and require taking apart. In any case, the shock oils should be changed 2–3 times during a season. The properties of the oils might fade or change over time. One problem is dirt and dust that gets into the shocks especially when driving in dusty conditions. When there’s dirt in the oils, the seals and other parts of the shocks will wear down faster compared to driving with clean oils.

When you’re changing the oils, start by removing the shock and cleaning it carefully. By cleaning the shock, you can make sure no sand grains or other particles will remain the shock that can damage it from the inside.

Do the following:

  • Remove the shocks.
  • Remove the spring from the shock to make handling easier.
  • When cleaning the shock, also clean under the rubber boot on the shock shaft, if there is one.

Now, empty the shocks. You can use a single-use cup and place a paper towel in the bottom that will absorb the oil in itself. Remove the cap from the shock and place it on a paper towel. Now, pour the oil from the shock in the cup. Move the shock shaft up and down a couple of times to remove oil from under the piston. When most of the oil is removed, place the shock upside down on a paper towel so the remaining oil will come out. Do the same with the other shocks.

  • If the oil that’s come out of the shock is dirty (dark and thick like jelly), remove and clean the seals at the bottom of the shock and rebuild the shock. By cleaning the seals, you can make sure the dirty oil containing sand and metal particles won’t wear down the shocks.
  • If the oil that comes out of the shock is still “normal”, i.e. runny and transparent, it’ll be enough to clean the cylinder with a rolled-up piece of paper towel. Clean the cap as well and if you’re using caps with bladders, check the condition of the bladder and that it fits properly.

Now, you can add the oil. I’d recommend using a work stand to keep the shocks upright during the assembly.

  • Pull the whole shock shaft out of the shock body before adding the oil.
  • Fill the shock about halfway.
  • Now, move the piston in the oil so that all the air gets out. Wait for a moment and move the piston again.
  • Next, add more oil until it’s 1-2 mm from the top of the cylinder.
  • Move the piston up and down and let them sit on the desk until all the air bubbles in the oil has disappeared.

The right way to proceed depends on the type of the shock. With all shock types, it’s essential that the shock is in an upright position so that the air bubbles can move right upwards.

There are several different cap types:

Emulsion shocks:
Air is allowed to mix with the oil. With this type of shocks, it’s particularly important to make sure there is no air in the shock when the shaft is pushed all the way up.

There are several types of caps for emulsion shocks
With the Bleeder type, the air is removed using the bleeding screw on the cap.
With the other cap types, the excess oil and air will come out through the threading on the cap.

Bleeder Cap on the left and without on the right

With both cap types, fill the shock cylinder up to the brim to make sure the space inside the cap will also fill up and any extra oil can come out.

  • Fill the cylinder
  • Prepare the caps: Remove the screw from the bleeder cap. Place seals

With bleeder screw. Screw in the cap. Screw in tightly using moderate force. Now, push in the shock shaft and the air and excess oil should come out of the bleeding screw hole. When you see that all excessive oil came out, you’ll know there’s only oil left in the shock. Screw the bleeding screw back in. Compress the shaft a few times. If there’s clear signs of air still in the shock, add more oil and try removing the air again.

If there’s no bleeding screw, fill the shock all the way up with oil. Before screwing on the cap, you can add a few drops of oil in the cap. Now screw in the cap loosely and carefully move the shaft all the way in. All excess oil and air should come out through the threading on the cap. Hold the shaft in and tighten the cap to get rid of the remaining excess oil. Now, compress the shock a couple of times and see if there is still air in the shaft.

There should be no rebound on an emulsion shock, i.e., when the piston is pushed all the way in it shouldn’t move outwards by itself once it’s released. It’s essential to have similar reaction in both shocks at one end (front/rear) of the car, so their functioning would be identical on both the left and right side.

Bladder shocks
If you’re using bladder caps, building the shock is similar to that in emulsion shocks without bleeder caps. Fill the cap with oil up to 1–2 mm from the brim, not all the way up because the bladder takes some space in the cap. With bladder caps you can adjust the rebound to make damping more progressive – the longer the shock travels, the stiffer it gets. A bladder will also keep the oil from foaming which makes the car move more smoothly during a longer drive.

When it comes to building, the only difference to emulsion shocks is that the rebound can be adjusted by how much of the piston shaft you push in before screwing the cap on.

  • The farther you push the shaft in, the less you’ll have rebound.
  • So, if you push the shaft all the way in, there’s no rebound and the shock works like an emulsion shock.

Adjust the rebound the way you want and hold it against the desk while you screw the cap on so the shaft won’t move outwards. When both shocks are ready, pump the shocks a couple times. Do the same on both shocks and check that the shaft comes back out the same on both shocks. If the one of them comes out more, there’s too much oil in it. Or if it doesn’t come out enough, there’s too little oil in it.

Tip! You get a suitable amount of rebound for a basic setup when you leave about 1/3 of the shaft out. You can build the shock with the shaft pushed all the way up. Both will result in a smooth and neutral outcome.
Note! See, however, that the shock shaft doesn’t damage the bladder and the shaft doesn’t squeeze up the bladder.

About us

RC Information

RC Information

Order our weekly newsletter

Your shopping cart is empty

Terms and conditions


All products listed as “in stock” are in our warehouse and ready to be shipped within the next day. Exceptions to this are pre-orders and possible, but unlikely, errors in stock numbers. All products include the  VAT according to the destination country.  Prices are subject to change without prior notice.

Customer service speed

We are answering emails everyday from the morning to the late evening, no matter if its Sunday or Christmas eve. We work in the EET time zone which is +2h from GMT. During the day our customer service is usually really fast and in the evening we are little slower due we have less people to answer questions. Easier things are usually handled within the hour and shipping related things we try to handle during the day so they can be shipped out the same day. Our goal is to answer all emails within 24h no matter how difficult the question is. The fastest way to get customer service is always to send us a email. Please include relevant pictures and a structured email with proper sentences so we can answer you faster. Take your time and read trough your email once before you send it to us.

Payment Methods and Shipment Information

We ship globally for example to Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden and United Kingdom, Norway, Turkey, Switzerland). And many other countries, just go to the checkout and see if you can checkout. If not just let us know and we will quote you a price as we are able to ship to any country in the world.

We accept Paypal, credit card payments, Apple Pay and IBAN/BIC (SEPA) bank transfers.

Payment service

Our credit card and web bank services are delivered by Finnish Paytrail Oyj.

Paytrail Oyj, Business-id: 2122839-7

Innova 2
Lutakonaukio 7
40100 Jyväskylä

We also have numerous local payment options available through our international payment service


Kraanspoor 39
1033 SC Amsterdam
Postbus 37159
1030 AD Amsterdam
The Netherlands

P: +31 (0)20 8500 500
E: [email protected]


All payments are made in Euros. You can however browse the shop in other currency but the price then is not final. You will see the final Euro price in your shopping basket when paying for the product. The price is shown in “5. Send Order” part of the checkout form.


Our shop automaticaly includes or excludes VAT percentage from the prices by the destination country. You can change the destination country from the checkout pages before you order.  All our customers will pay the same price no matter the included VAT percentage. Companies who are buying with VAT numbers can buy products with exluded VAT according to destination country. 

Shipping options

You can browse all our shipping options with out registering. Just add the products you are interested in and proceed to checkout page where you can see all the shipping options and estimated delivery times.

Basic tracked shipping starts from 6,90€ (GLS road freight) in European Union countries.

Estimate Shipping times with GLS.

An international GLS parcel is delivered to neighbouring states of Finland like Sweden or the Baltic countries in a standard delivery time of 24 to 72 hours. To more distant European countries the international parcel dispatch takes between three and six working days, to remote areas up to eight days. Rough estimate is 1 week from order to delivery.

Please note that GLS shipping time is calculated in working days (Monday to Friday) and excluding the day when parcel is shipped.
Here you can find estimated delivery times.
Note! Here you can find collected statistics about average delivery times.

Estimated shipping times by DHL and UPS

DHL Express and UPS Express are our fastest delivery options. Both options can reach almost anyplace in EU in 1 day, but some places take 2 days.
• Depending what kind of products you want to order the shop will let you choose from available shipping options.
• Both Options are also Door To Door Services. The Courier will deliver the parcel to your door. But they also have pickup points where they might drop your package off so you can pick it up when it suits you.

UPS Standard is a slower and cheaper option from UPS for most European countries. Delivery time varies from 2 to 7 working days depending on the location. 

When you are checking out your order you can see a more precise estimate of each shipping option to your country.

Refund policy

We accept returns of new, unused merchandise within 14 days from the delivery. Please contact us at [email protected] to receive return information. The customer is responsible for any return costs unless otherwise agreed to with our customer service. We try to return the money with the same payment method that was used to pay for the order, if its not possible we make a wiretransfer. You can also request a gift card if you are making a new order to speed up the process.

We also accept returns after 14 days upto 50days, but we refund them with a giftcard to our shop so you can replace them with any products we sell. Please contact our customer service for details.

After we receive the merchandise and verify its re-sellable condition, we will refund the money or give you a giftcard. Depending on the item this will take 1-3 days after we have received the item. If there is a delay we will contact you.

Please note that all parcels that are returned to us because customer has not picked it up / accepted it or paid customs fees of it will processed. Handling and shipping costs will be reduced from the refunds.

Note! Every return made without notice via email will be charged with handling fee of 20€. Handling fee will be reduced from the total refund.

Damaged Shipment

In the rare occurrence that the shipment has been damaged, please take pictures and send those to our customer service [email protected] immediately and we will make sure we get you sorted and back to enjoying our hobby. Also notify the courier bringing you the shipment that it has been damaged.

Defective parts and Warranty Issues

If you feel that your product is defective please send us a email and we will let you know what to do next. Most items do not have a warranty as they will break in normal usage. For example if you hit something solid or take a larger tumble. Properly used items should easily last 3-12 months and during this period we are able to replace broken items if they have a manufacturing or material fault. We have years of experience with different makes and they all have different warranty policies. We have chosen to work with brands that have a good understanding how to serve their customers and you can be assured that you will get the best customer experience possible with us.

We do not replace or exchange products that are not defective or broken by improper use or have not been maintained. But we do help and teach you how to do things properly so you do not break anything in the future, just email us and we will help you out. We are however unable to wrench for you, its part of the hobby so its important that you will learn that part also your self, we have great tools to sell you so just ask us what you need.
Note! Many manufacturers are strickt that electronics are not allowed  to be modified (connectors changed etc.) without disabling the warranty. Remember to check this from your products manual.

Don’t worry you are safe with us! Most of our customers feel that they get excellent service in the rare occurrence that they encounter a problem with the product they have bought.

And remember if you run in to a problem or you feel that there is a problem with arrived products do not hesitate to contact us. We are here to help and we do our best to sort it out as soon as possible.

What happens if EuroRC made a error in the shipment?

We ship a lot of orders each day and rarely there are errors. We do however try to minimize the effect on the customer. Please contact us immediately if we have made an error and we will make it right.

Address for returns

Always contact us before returning any product, we can not take responsibility for shipments that are sent without prior notice. Its very important that we can tell you how to mark the parcel so it will be processed in a timely fashion.

EuroRC Oy
Päiviöntie 8
12400 Tervakoski

[email protected]



My account

Customer service

More info