The 4.3 engine is the M113 type which in MB circles is considered one of the best, mine is an E class year 2000 , it has full MBSH I have all the receipts/bills none are frightening . The mileage of the CLK would put me off but if it has a full MBSH you could take a chance, mine has covered less than 35,000 miles as for MPG I do no town driving in it at all the least has been 23mpg the best 30mpg. I have replaced a couple of tyres on it due to age not wear also had an oil & filter change it had just had a major service before I purchased it , it always brings a smile when I drive it the power is phenomenal the original bill of sale is £54,937 . I purchased it from MTSV it was up for £5995 I paid £5250 sold the Mig for £750 so for £4500 I was quite happy, the MB owners club have confirmed that it is probably one of the best examples in the UK. Don't bother with a V12 the V8 is more than adequate.