Engine fouling Plugs-2019 250 Pro XS

[bassm1n]

SN 2B573392. About a year ago at 70 hours I fouled plug for cylinder 6 badly. Dealer said plug wires on recall and replaced wires and all plugs. Fast forward a year with 90 hours and I had another issue with roughness. Took in and plug for cylinder 7 fouled. Replaced all plugs again. Boat is out about every 3 weeks and I have just a couple of short idle zones on lake. Rarely run over 5000 rpms. No faults or codes. I am concerned over what would be causing this issue and how I can keep from replacing again in a year when out of warranty. I use the cocktail. Could it be the deteioration of the fuel since I only run 3 gallons out each use but add new fuel periodically. Fuel is 87 octane with ethanol. And ideas? Thanks.

[Capt James]

run it wot every trip for a few mins.

[bassm1n]

Ok. Thanks

[mactlman]

using carbon guard in fuel?

[lakebouef5]

My 2020 engine went 300 hours on a set of plugs. My engine smokes some on Start up, whether I leave it level or trimmed. A few of the plugs looked like they were just about to be fouled. I hope I get 300 hours out of this new set....fuel additives may help with carbon build up, but I doubt they help a lot with engine oil being burned by plugs..

[SilverFox579]

using carbon guard in fuel?

Not necessary if he's running Don's recommended cocktail.

Would be interesting to see run time history on his engine.

[bassm1n]

I am sure dealer had the rum time history but never mentioned it. Just said to run engine harder since V8’s need to be run hard.

[EuropeanAM]

using carbon guard in fuel?

Quickare and Quickleen are the recommendations.