I hear ya Tom. My truck is way over due for a tune up too and like you, I should know better.

I once ran a set of Bosch silvers 60 k miles,A few months later when the platinums that replaced them started fouling, I put them back in for another 10k. 35k is about the most I run regular copper plugs. My cars are I 6s and plug swaps are easy.

Hey Guys do Glow Plugs Qualify lol ! Just Replaced my Original Set 300,00 KM F-250 International Navistar 7.3 litre.

P.S. Rule of thumb I have always used . NGK for Japanese
Champion for Domestic and Bosh for European ! But as a current forum member has advised the proper x-referenced plug from any Major Manufacturer , Properly Gapped will Suffice !

I hear ya Ewalk.For filters and plugs- put Motorcraft/Autolites in Fords, AC in GM, Mopar/ Champion on Chryslers. I especially like oil and air filters that are made for the vehicle. The old Ford got import plugs this time though. Always had Motorcraft filters. Have a newer GMC- gotta learn about that Dex-cool before too long. Volvo takes G5, DOT 4 SL6,- and Toyota trans fluid.... Mind boggling I know.

I hear you on the Gear & Transmission Fluids Tom ! Just when I had it all prepped out Ford vs Gm vs Mopar , I had to buy a Jeep back in 1984 (Wrangler) CJ-7 talk about a Heinz 57 lol... sure kept me busy x-referencing on fluids :)

The AMC cars were odd like that weren't they? Kind of like our Volvo has a Toyota transmission (Aisin ?) or at least somehow related. It was nice to pay ~ $6 liter rather than buy the high $ Volvo stuff.

Yeah AMC kinda messed with yer Head , Ford Electronics , Chrysler Straight 6 (4.2 litre) Engine was Bullet Proof but it had a Carter Altitude Compensating Carb that never worked properly , I eventually replaced with a new Intake Manifold and Holley Two Barrel with Manual Choke . Believe it or not had a 5 Speed BMW Shifter along with Dana 44 & 48 Front and Aft. Nice Play toy but as you can imagine you had to have a Service Manual to keep on top of things. I had it for 8 yrs and finally let it go to a Youngster who made a Mud Bogger and Rock Climber out of it lol . It was a fun Ride , but like all Jeeps you had to be Hands on . :)

I have not put spark plugs in an automobile in ten years - they're all 100K on plugs these days. As for my OPE, as long as they start right and don't show any symptoms I don't change plugs. I finally had to put a plug in a mower I bought in 1989, but only because I gave it to my brother-in-law and he nearly ruined it with years-old gas.

I here you Saxman ! I remember back when you routinely changed Plugs and Point & Condenser much more often. I guess with new Electronic Ignition , Computerized Fuel Delivery and better Plug Technology we are seeing much better performance and reliability. I just picked up a 1997 Geo Tracker for a Rural Mail Route. I changed the Fuel Filter , Air Filter along with New Plugs , Wires and Distributor . All appeared fine but since it had 250,000 KM thought I might as well get this along with Valvoline High Mileage Oil and Fram Filter out of the wya. I was surprised at the increase in performance and fuel economy change for the better , since all had appeared in the ball park previously ...guess you never know ? Anyhow time for the Mail to Go lol , Have a Great Day All :)