Some suggestions:
- I put the page in a few categories, you might want to put it in more if it fits
- Some sites where you could add a link to your page:
http://www.appropedia.org/Portal:Transport
http://en.wikipedia.org/wiki/Head_gasket
- Cite using the <ref> code, I did the MLS reference for you, if you want to use the same reference again just type <ref name=MLS/> so you don't have to type the whole thing again, this way they automatically show in your references section
- Linking to wikipedia, wiktionary, and other sites will help readers who don't know some of the basic concepts, I did a few so you have the code
- It would be good to add some images
- In many sections you use both bullets and dashes, bullets on their own look better
- Instead of using bold and italics you can add subsections like this:
==Section== Gives you:
Section
===Sub Section=== Gives you:
Sub Section
====Sub Sub Section==== Gives you: