I have a Silverado and am going to do a 100,000 mile tune up. Ac-Delco changed plugs from a 41-952 to a 41-985 iridium Plug. I think the old plug was platinum. Can I run Bosch Platinum Plus or do I need to run AC Delco? I have read both on sites but want to know what have you guys done?

You'll never go wrong using OEM! Given the choice I'll choose that every time. I have nothing bad to say about Bosch, but why switch if you haven't had any problem in 100,000 miles?

Have you checked the price on the OEMs? When I had a 5.3L I went to NGK plugs. Lots of people do and they work fine.

Stick with the O.E. A/C Delco plug. Yes they are expensive but if you figure that you have to only change them once per 100k versus being on your third tuneup if it had conventional plugs your ahead on out of pocket.

DO NOT USE BOSCH PLUGS IN A GM VEHICLE!

Second the motion on the DO NOT USE Bosch in GM . I did once and in less than 12,000 miles tips from two plugs disintegrated , why ??? cost me extra dough to figure out what was wrong , then installed OEM and went another 100,000 miles and were fine but replaced with OEM again .99 Suburban 272,000 miles and still runs like a top...........

Ac Delco are $7 ea for the factory ones. Bosch 2+ plugs are $3 ea. Why do you say do not use other plugs?

I run the AC truck plug in mine.

The O.E.M./factory has built in some ways the eng. around the spark plug. Now, not to say the O.E.M./factory has built an eng. around the wrong spark plug, would be wrong, but for the most part the O.E.M./factory makes the best spark plug for that particular eng…

The list of "why" to run O.E.M. plugs is long, but things like fuel econ, miss fire issues and check eng lights top that list.

It’s like putting vegetables in a fruit salad. It can be done, but it’s the wrong thing to do. Stick with the right stuff.

OE!!! If you shop around you can find a better deal then $7 a plug!

Any Ideas where that would be?

I have found some good deal on oe parts in Walmart, Autozone, ebay. Just check around. I bought my last set for my truck for about $2 per plug at Walmart. Although that was for a ford, Motorcraft.

I also stick with the OEM when I change them out. I figure if it ain't broke...

Just wanted to try something different, with so many kinds of plugs these days thought maybe there was one that someone put in that made a mpg or more hp.

Not a problem. I'm not knocking looking at using a different plug. I'm just too lazy to try and figure I can't go wrong using whatever the original type was. I'm sure there are probably better ones to use.

OK.. I put Bosch Platinum +2 in my Sierra (5.3l V8) nearly 80,000 miles ago. I could double check my records to confirm the actual mileage but I have changed plugs once since I bought the truck (bought it at 40k, have 185k now).

If there is a good reason, I'll pull them out quick. But when Airjer tends to recommend something vehicle related... I'll listen. My guess is if there was a problem, I'd have noticed it by now???? Yes??? Should I be concerned?