Folks, here's a response from Autolite in reply to my message about (1) antiseize and spark plugs and (2) which Autolite Titanium plug is used with the B230 series engines:

Thank you for the e-mail regarding your seized spark plugs in your 1990

Volvo 740 2.3L engine. We welcome the opportunity to be of service.

We do not recommend the use of any anti seize products for installing spark plugs. Anti seize compounds are typically composed of metallic,

electrically conductive ingredients. If anti seize compounds come in

contact with the core nose of the plugs, it can lead to a misfire condition.

Anti seize compounds can also have a torque multiplying effect when

installing plugs. This can lead to thread distortion and thread galling

resulting in cylinder head damage. Autolite spark plugs are nickel plated

to resist the effects of corrosion and seizing. However, plug seizure is

aggravated further when steel plugs are installed into aluminum cylinder

heads for a long period of time.

According to our data, the ATi64 is the Titanium spark plug recommendation

for the 1990 Volvo 740 2.3L FI engine. The inclusion of Titanium in spark

plug design was chosen for it's anti seizing properties. You may want to

consider the ATi64 along with periodic inspection of the plugs to reduce the likelihood of plug seizure during extended plug service intervals.

Thank you for choosing Autolite spark plugs.

Cordially,

Scott Jacobs

Catalog/Technical Service Representative