Me - Guys, need some spark plugs for my 8000's (Also had to drop off a couple other things to pick up later that afternoon). Dealer #1 - Dont have any in stock - back ordered. All our NGK's are. Me - No problem. Are the NGK's the only spark plug I can use for the 8000. Dealer #1 - Yep. Me - Okay. Gimme the plug # for that NGK, I gotta do some other shoppin' today. Later that day @ Dealer #2's shop... Me - Hi folks, need a couple of plugs for my 8000's. Dealer #2 - Sure got 'em right here - Denso's. Me - Denso's? I was told to only use the NGK's. Dealer #2 - Huh? This is the only plug we use for our 8000's. Me - Fine, fine...give me a couple of 'em. Back to Dealer #1... Me - Guy's I picked up some Denso's for the 8000's...Dealer # 2 said this is all they use, whadda ya think? Dealer #1 - Hold on...lets see if Redmax can cross reference that plug #... Me - Sure OK. Great idea. I'll browse around. Dealer #1 - Just got off the phone w/Redmax, no can do, they cant recommend that plug. DO NOT USE IT. Me - Hey how come this new 8000 sitting on the shelf comes with a Champion plug? Dealer #1 - They just do when new. Me - So Redmax only recommends the NGK, but puts Champions in the 8000's when new and I cannot use my Denso's? Dealer #1 - Yes. ~~~~~~~~~~~ So here are some plug #'s: NGK - C-MR7H Denso - U24FSR-U - Anyone use these Denso's? Anyone?