Look on the id plate on your radiator support. See all the 3 digit numbers?
Look for 491 or 494, you will have one of them. 491 is Fed version, 494 is Cal
Spark plugs last a lot longer when you use 100% unleaded gas.
No, it is correct. Fed cars did use leaded gas, leaded gas make spark plugs wear
so Fed cars require spark plugs every 15K. Didn't the UK recently, i.e.within 2
years ago, finally
switch over to pure unleaded gas?
But here in the US we've used unleaded gas for a while. In fact my 380 says
unleaded gas only...so if it's federal (I know it's not californian) why
should the spark plugs only have half the life of a non federal?
What makes the spark plugs wear faster in a leaded gas car is the fact that
the car has a high compression engine and this is the exact reason you need
leaded gas. Because of the higher compression ration you need leaded gas to
keep the combustion mixture from pre-detonation which can damage an engine
and cause power loss. And the higher compression of the engine causes the
plugs to wear much quicker. 10K miles was about tops for plugs in cars in
the 50s and 60s. And if you had a really high performance racing engine the
could go thru a set of plugs in just a few thousand miles.
In the case of 1985 MB 380SE I doubt if there are two different engines
with different compression rates. I suppose they have the same
compression (Fed and non-Fed versions).
Lead was replased with MTBE some 10 years ago. MTBE raises gasoline
octane value as lead did before.
Right on target....My 1992 190E 2.6 is a "FEDERAL" originally sold in the
Midwest. It does however meet Cal. emission standards. The only difference
that I am aware of is that it does not have the Check Engine light
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