Re: {Chrysler 300} 300k question

Zinc is necessary for sliding surface valve trains such as our cars have. The area in question is the lifter to cam lobe which rub instead of roll as they do on modern roller valvetrains. I have read this debate for years on the various Corvette forums and some of the smartest people there conclude that using a diesel oil such as Rotella takes care of it. I am married to the boutique oils which probably cost too much but I am superstitious.

As for lead, this is completely unnecessary in a hobby car used for hobby purposes. If you are going to tow a trailer up a steep grade at high speeds every day then you should worry about valve seat recession. Otherwise don't worry about it. So says most of the engine people I respect.

Danny Plotkin

Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------

From: Tom Wilburn <tomwilburn1@xxxxxxxxx>

Date: 3/1/24 11:26 PM (GMT-05:00)

To: Ron Waters <ronbo97@xxxxxxxxxxx>

Cc: chrysler-300-club-international@xxxxxxxxxxxxxxxx

Subject: Re: {Chrysler 300} 300k question

Ron

Thank you for this.

I thought the lead in gas prevented valve seat wear and recession by both cooling and lubricating the surfaces of the valve and seat.

I realize the valve guides must be lubricated by something, but will enough oil get to the valve and seat for zinc in the oil to protect them? It would seem a more difficult challenge than blending zinc in gas.

Tom

Sent from my iPhone

On Mar 1, 2024, at 11:00 PM, Ron Waters <ronbo97@xxxxxxxxxxx> wrote:

Lead additives are a waste of money. People that use them don’t understand that, for lead to be effective, it needs to be blended in with the gas. It *is* a good idea, however, to use a high zinc oil, like Valvoline VR-1. If your engine is rebuilt or low mileage, use 10W-30. If it has high mileage, you may want to consider 20W-50.

Ron

From: chrysler-300-club-international@xxxxxxxxxxxxxxxx On Behalf Of Michael Corrigan
Sent: Friday, March 01, 2024 8:35 PM
To: chrysler-300-club-international@xxxxxxxxxxxxxxxx
Subject: {Chrysler 300} 300k question

I finally picked up the very original K that I bought a few months ago. My question for the group is whether these cars of this vintage require lead additive? It seems to run OK on unleaded but I know that that can be deceptive thoughts?

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