Re: {Chrysler 300} Lead additive

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On Jan 6, 2026, at 9:57 PM, 'Noel Hastalis' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> wrote:

Danny,

My F motor - original block - has been rebuilt with hardened valve seats so I don’t use a lead additive. I do add a few ounces of Marvel Mystery Oil with every fill-up. Run the highest octane available 91/93. Ethanol free gas here in the Chicago area is only a pipe dream, so only running the corn gas. I do have an electric fuel pump, that Joe Jordan installed, mounted just fore of the gas tank and that helps a lot when the car has been sitting more than three days. Otherwise, as has been said here, it takes extended cranking to fire it up. Since I bought the F 20 years ago it’s had no butterflies in the heat risers so that’s a non-issue - whether I’ve fired up the motor in 10 degree or 90 degree temps to take it out for some exercise. Certainly takes a little longer to warm it up when the temps are sub freezing.

Noel

p.s. I started adding the Marvel Mystery Oil over 10 years ago after meeting a fellow displaying an immaculate black 300-G coupe at Iola, who highly recommend recommended it. I’ve never seen his G since. His business was building diesel engines of all sizes and said he adds Marvel to every motor.

Sent from my iPhone

On Jan 6, 2026, at 6:42 PM, dplotkin@xxxxxxxxxxxxxxxxxxxxxxxxx wrote:

You may drive it around the world and back with no lead and no problem. Does Noel use lead in his F?

Daniel D. Plotkin

Daniel Plotkin & Associates LLC

54 Capri Drive

East Longmeadow, Massachusetts 01028

413 237 9629

dplotkin@xxxxxxxxxxxxxxxxxxxxxxxxx

-----Original Message-----
From: "'Richard McFarland' via Chrysler 300 Club International" <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Sent: Tuesday, January 6, 2026 7:20pm
To: "Club International Chrysler" <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: {Chrysler 300} Lead additive

Don’t want to start a big back and forth but I have one of “ those” questions. I have a 63 non letter 383. I have been running a lead additive as I’m not sure if Chrysler was using hardened valve seats in 63. I have heard yes and no. It’s kind of a pain and getting expensive as I do drive the car quite a bit. Some of you gurus: do I need to run the lead additive? It has 93,000 original miles and never been out of the car.
Thanks
Sent from my iPad

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