[Saloon-lovers] Fuel additive - XK 3.8L engine

Hi all,

Have just got my 1960 BRG Mk2 back from the shop after having a XK
3.8L engine fitted. Now, the engine # put in is 7B615***: which I
believe is actually a 3.8L engine from an S-type?

Now, these engines were built in the day of leaded petrol, to
protect the valve seats etc. Given we no longer have leaded petrol,
do I need to put lead-replacement additive in the fuel?

I have been told several stories:

  • It can’t hurt.
  • it will deposit on the piston head and cause pre-ignition
  • it doesn’t need it because the cylinder head was manufactured
    with hardened seats.

I have plenty of additive (kindly given to me by a friend with a
Valiant Charger (Aust) whose engine was modified to hardened
seats) - however, I’m not sure whether I should be putting additive
in my fuel tank.

Any help/assistance appreciated.–
jag060
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In reply to a message from jag060 sent Mon 1 Jun 2015:

jag060,

This has been discussed many times and can be found in the
archives. It doesn’t need it.

Paul–
The original message included these comments:

Have just got my 1960 BRG Mk2 back from the shop after having a XK
Now, these engines were built in the day of leaded petrol, to
protect the valve seats etc. Given we no longer have leaded petrol,
do I need to put lead-replacement additive in the fuel?
I have been told several stories:


PS
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In reply to a message from jag060 sent Mon 1 Jun 2015:

Daniel,
As Paul says, you don’t need a lead additive. Dry Fuel, or
similar… now that is worth putting in the tank, at least at the
end of the season before the layup.

Andrew–
The original message included these comments:

seats) - however, I’m not sure whether I should be putting additive
in my fuel tank.


1968 3.8S
Zurich, Switzerland
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In reply to a message from PS sent Tue 2 Jun 2015:

Thanks Paul & Andrew.

Safe driving :)–
jag060
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