Lead Subsitute Advise Please

[Guest oldgitmk1]

Hi, I'm using castrol as was graham who built the car I have been given 500ml of Morris superclean zero lead 2005 the instructions on the label says nothing about it mixing with any other brand. Can i use this or do i stick with the castrol.

[Longboarder]

Morris say it doesn't mix with other lead replacement products. Castrol Valvemaster seems to be well recommended. Are you sure your engine needs lead replacement? I'm expect the builder checked it out but heads are marked. It's one or two letters on the exhaust flange face just behind the spark plug. Pic below.

Even if it does currently require lead replacement getting hardened inserts for the exhaust valves is simple (for an engineering shop!) next time you have the head off.

 

Nigel