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Benefits of upgrading my carburettor

I recently purchased a B reg Mercedes-Benz 190 2.0-litre carburetter model with only 26,000 genuine miles and have since done another 15,000. Everything is absolutely fine apart from the fuel consumption which is horrifying.

A few folk, mechanics and enthusiasts included, have told me that upgrading to a newer or aftermarket carburettor might improve fuel efficiency. Would you agree? Also, in your opinion would such an upgrade have any affect on performance or insurance (ie would this count as a modification)?

Also I seem to be going through a lot of oil - adding a litre around every three months. Does this seem normal? There is no smoke or leaking that I can see (either in the engine bay or on my parking spot).

Asked on 17 December 2012 by Dan R

Answered by Honest John
It's an ancient car. The carburettor will be worn. The valve stem oil seals will be worn. The trouble is, a new car will be a major expense, assuming you can get one. First thing to do is a fuel system clean and a new set of spark plugs and leads.
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