Spark plug recommendation

[amajamar]

Hi all,

My "new to me", 2002 310 Sundancer has the following engine serial number OL677287 (Horizon), and when I look up the part number for the spark plugs it's #803990 which relates to a superseded NGK BPR5EFVX (platinum, I think) which was replaced with a NGK TR51X irridium plug. These are painfully expensive, which I'm sure you all know. Interestingly, an alternate part number which relates to the MAG MPI version of the engine is #816336, which corresponds to a practically free, NGK BPR6EFS.

Depending on who's parts website you are on, they both cross reference the same engine, either MAG MPI or HORIZON.

So what plugs do you use, why, and what's the real difference between them?

Thanks in advance!

 

[scoflaw]

They both will work, the diff is how long they last. Depending on how difficult your plugs are to change out the choice is yours. Iridium is what GM calls their 100,000 mile plug

 

[Phlorida]

Rock Auto has the NGK Iridium plugs for $6.50/each. The copper version are $1.58/ea.