Everybody seems to recommend that Diesel Purge from Liqui Moly, however there is only one retailer selling it here in Sweden and I'd have to mail order. A local auto parts store however carries another product, Injection Cleaner from STP. Anyone tried the STP cleaner? Does it work or would I better get the Liqui Moly product by mail order?

Thanks..

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Tomas, Sweden
1966 Mercedes Benz 230S with OM617.912, automatic. Disk brakes from W108
1983 Mercedes Benz 300TD grey, OM617.912 and 5-speed manual
1983 Mercedes Benz 300TD blue 7-seater, OM617.912 and 5-speed manual