Hi Barry, That was a very interesting read. As you know I have had my car from new since December 2000. I assembled it from kit form. I have always changed the oil on a regular basis, and did consider changing the foam last year. But the £50+ from Caterham put me off (delayed me). So will be considering it as a job for this winter. However, the car has just gone over 12,000 miles, and hasn’t been driven since the MoT last October! So in reality it might be done next year now. Are you enjoying the 1600 8v? It is just right for me. Cheers Paul