BMW M5 Forum and M6 Forums banner

1 - 13 of 13 Posts

·
Registered
Joined
·
170 Posts
Discussion Starter · #1 ·
Hi all, does anyone know what the best spark plugs are and how often they are best to be replaced, also is this a DIY job? Any special tools? Or is it best left to specialists? Happy driving, regards, Ste.:checkeredflag:
 

·
Registered
Joined
·
1,938 Posts
I've heard great things about Bosch Fusions in an e39 M5 application. I don't know, you might need an extension for your ratchet if you don't have one because the spark plugs are buried deeper on the beast than most other cars and the average time for doing it yourself is 3 hours for most people their first time changing them, but I hear that future changings are much faster and easier after you've done it once. NGK would be my second choice, but I wouldn't go with Denso's I understand they don't last very long in our cars.
 

·
Registered
Joined
·
135 Posts
Just a suggestion...

A number of people have reported valve cover gasket leaks which will be uncovered while you are changing the plugs. The work to change the gasket is the same as changing the plugs plus a bit more.

The gaskets are also cheap (on the order of 20ish bucks). So I suggest you go ahead and get the gasket replacement parts and be ready. If you find a leak you are ready to get everything done at once.

I was not so lucky, spent 2 hours changing plugs then spent ~4 hours changing the gasket 2 weeks later.

You'll definately want extensions and then one of those magnet things to retrieve the extensions when they drop down...not that that happened to me.:3:

K
 

·
Registered
Joined
·
1,055 Posts
I did it in about an hour. Universal joint *REALLY* helps, plus multiple extensions. Also a snub nose spanner. I also had to use a short breaker bar to get the plugs out (when using extensions and universal joint). This scared the s*** out of me.
 

·
Registered
Joined
·
2,078 Posts
I did it in about an hour. Universal joint *REALLY* helps, plus multiple extensions. Also a snub nose spanner. I also had to use a short breaker bar to get the plugs out (when using extensions and universal joint). This scared the s*** out of me.
+1 This is a pretty simple job with a couple of extensions and wobble/universal joints for the ratchet. Make sure you have a Torque wrench so as not to strip the aluminum heads....you don't want to go there!

As to what plugs..don't deviate from OEM (Bosch or NGK) there is nothing to be gained by changing to another type

Brian
 

·
Registered
Joined
·
1,055 Posts
+1 This is a pretty simple job with a couple of extensions and wobble/universal joints for the ratchet. Make sure you have a Torque wrench so as not to strip the aluminum heads....you don't want to go there!

As to what plugs..don't deviate from OEM (Bosch or NGK) there is nothing to be gained by changing to another type

Brian
Torque spec on plugs is 30 Nm. Make sure you:

1) Use anti-seize lubricant on threads (or might be last spark plug change in your beast)
2) Torque properly!
 

·
Registered
Joined
·
555 Posts
Use electrical tape to hold the spark plug socket to the extension...this way you don't leave the socket down there w/ the spark plug.

Jeff
 

·
Registered
Joined
·
1,055 Posts
Use electrical tape to hold the spark plug socket to the extension...this way you don't leave the socket down there w/ the spark plug.

Jeff
Or if you need to buy tools to do this, get a locking extension bar.

Here's my tool list:

13 mm socket (I think it's 13--but it's the only one you'll need other than the 5/8 socket for spark plug)

5/8 socket for spark plug (rubber back to hold plug)

10" extension

6" extension

3" extension

Universal joint (or wobble joints on extension bars)

Spanner

Snub nose spanner

Breaker bar (if needed)

Valve seals (might need this--easier to do once you're in there)

Spark Plugs
 
1 - 13 of 13 Posts
Top