Re: Engines that are prone to sludge

The following is JMHO!
NORMAL driving is considered driving on the highway for an extended period

of time.  OK what percentage of drivers have commutes like that especially

with the price of gas today?  ;-)
This is great for an engine to operate at normal operating temperature to 
help burn off any moisture in the oil and maybe any carbon in the engine.
These engines can last a very long life (100s of 1,000s of miles) and the 
oil does not get dirty too fast generally!
I have seen many different engines live long lives this way, foreign and 
domestic.  Of course there are some engines that just designed to fail
after 
XXX miles no matter how they are driven.  <g>

Most vehicles are NOT driven this way but are driven in the city.  The 
engines use more gas, create more carbon and the temperatures are usually 
colder than normal adding condensation/debris to the oil.
These engines require more frequent oil changes!
I have even seen VW engines get sick prematurely.  :-(
-- 
later,
(One out of many daves)

"jan siepelstad" <jan@[EMAIL PROTECTED]
> wrote in message 
news:4356$488b2726$d97b6566

snip

>
> I have driven 480,000 km (300,000 miles) with my 98 camry up to now.
> Last week opened the valve cover and everything looked like new!!
> No sign of any sludge at all!
>
> But I must say, I generally drive long distances (over 50 miles) and my 
> fuel is propane.
> I change (synthetic) oil every 30,000 km (19,000 miles).
>
> Jan.
>