Find Parts & Accesories for your Porsche
Spark Plug, Bosch WR5DC

Spark Plug, Bosch WR5DC

Rating(s) starstarstarstarstar (0)
Availability: In Stock
Our Price: $2.50
Please start by selecting your Vehicle above. If you know our part number please select from options below.


Product Description:

Bosch WR5DC spark plug
Bosch Discontinued the original W5DC spark plug in 10/2007. Bosch has replaced almost all of their copper electrode spark plugs with resistor style plugs. Resistor style spark plugs are required when using DME, (digital Fuel injection), because the electrical impulses from the ignition system can and will interfere with the sensors used on most electronically fuel injected engines.

The total system resistance used on factory Porsche vehicles that use a CDI ignition are tuned to give the optimum amount of spark energy to the plug. Now yes you can use a resistor spark plug with a CDI system but our research has shown that the location of the resistance and the total amount of the resistance per spark plug is key to getting the best out of the CDI.

We would recommend using this plug in a high compression electronically fuel injected engine that is running a TCI or other type of inductive ignition system, where you require a spark plug with a "5" heat range.

Manufacturer Information:

Bosch spare parts are available for almost all vehicle types in ex-works quality. This means that spare parts from Bosch have the same first class quality as those fitted in your car by the manufacturer. We use Bosch in preference to other brands when available.

Reviews and Ratings:

0 Customer Review(s)
5 Star
0  (0%)
4 Star
0  (0%)
3 Star
0  (0%)
2 Star
0  (0%)
1 Star
0  (0%)
Please login first to write a review.


  • 1984 Porsche 911 Carrera
  • 1985 Porsche 911 Carrera
  • 1986 Porsche 911 Carrera
  • 1987 Porsche 911 Carrera
  • 1988 Porsche 911 Carrera
  • 1989 Porsche 911 Carrera
[All vehicle fits]

Return Policy

Please inspect your order as soon as you Receive it. You must notify us within 5 days of receiving the order of any missing or wrong parts.

If your package is damaged in any way, you must notify the shipper (FedEx, Post Office, etc.) as soon as possible to report the damage.

All returns are subject to a 25% restocking fee, with the exception of pre-approved warranty returns, or if we ship a different part number than ordered. There will be no returns after 30 days of purchase. Non-warranty returns will not be accepted if the parts have been installed, damaged, misused, or are not sellable as new parts. Special order parts are not returnable except for pre-approved warranty. 

You must obtain an RMA number from us before returning your item. You must obtain the RMA by phone. Requests for an RMA number via Email will not be answered, as we cannot guarantee that any email will reach its intended recipient  All returns must be shipped freight prepaid, orders shipped freight collect will be refused.