Not much gas mileage.
Be sure the engine's timing chain isn't too old - over 120K miles.
Chains stretch and eventually break - the pistons hit the then
unsynchronized valves, bend and break them, the valve guides and the
cam. A big expensive mess, cost to fix is about what you will pay for a
cheap 420SEL, so change the chains when you find the right car and it
will be fine for a long time.
The rule of thumb on SEL timing chains is 100K miles and/or 10 years. While
the chains seldom break, the guide rails contain parts which become brittle
over time and miles. These parts then break and fall into the teeth of the
timing gear which then causes the timing chain to jump resulting in major
damages to the engine components. Regular oil changes will make the chains
and all engine parts last longer but you are taking a chance if you deviate
from the 100K/10 year rule. Also make sure the AC works as that is an
expensive repair. Make sure the tranny oil has been changed regularly. The
best used MB to buy is the car that comes with complete service history.
You will pay more for a cream puff with records, but you won't regret it.
And be sure to have the car checked over by a qualified MB mechanic. Pay a
bit more upfront for a good car WITH RECORDS and save a lot of $$ later.
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