Locate the battery on the left side of the engine bay.
If your battery has a cover on it, remove it and set it aside.
Before proceeding, identify the positive and negative leads coming off the battery. The negative lead is generally black and may be marked with a "-". The positive lead is often red and may be marked with a "+".
Never bridge the terminals on the battery with your hands or tools. Shorting the battery can severely injure you.
Look for corrosion on the battery terminals. Corrosion can be either white, grey, or blue and will generally be quite noticeable.
When working with batteries, you must always remove the negative lead from the battery first, even if the corrosion is only on the positive lead.
Using a 10mm hex wrench, loosen the nut on the screw holding the negative terminal in place.
If the corrosion is preventing you from accessing the nut, use the other (open) end of the wrench or a wire brush to scrape some of the corrosion away.
Pull the negative battery cable off of the negative lead.
For this guide, we only show the removal and cleaning of the negative terminal. If you are going to clean the positive terminal, first remove the negative terminal and then remove the positive terminal. The process for removing both leads is the same; it is only the order that is important.
Scrape the corrosion off of the battery terminal using a wire battery brush or some other scraping/brushing tool.
You may want to avoid getting the corrosion all over the inside of the engine bay. Sweeping the corrosion onto a paper plate or rag is a simple way to get the corrosion out of the engine bay without making a mess.
Open a packet of battery terminal protector, and, using your finger, coat the (now assembled) battery terminal in a thin layer. Be sure to cover the outside of both the lead and post, but not to allow any protector between the post and lead.
Locate the dipstick on the right side of the engine.
Remove the dipstick from its housing and wipe it off with a rag.
Re-insert the dipstick, and then remove it. This will give an accurate reading for the level of oil in the engine.
The oil level should be between the two dots marked on the dipstick. If the oil level is below the bottom dot, or there is not any oil on the dipstick at all, you will need to add oil.
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