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Originally Posted by Viney
Quote:
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Originally Posted by Sid Squid
Is a kinda ratty blue naked one?
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Only on cold days when he forgets his jacket  |
as for the engine life thing, Sid's spot on. The easiest life an engine can have is to be run 24/7 at mid speed and mid load, like 70mph on a motorway. Last forever.
The engines that gave us most problems when I worked for a car manufacturer were the school trip/weekly shopping ones. Cold start, never goes above 2000rpm (big car+4Lt engine+auto box typically), drives 2 miles then stops for several hours, repeat for 5 days/week.
Lots of problems with valve deposits and loss of compression, rings sticking etc etc.
A typical car engine needs to get above about 3000rpm to get the valves to rotate. Pottering about means they tend to stay in one place and don't clean the seats effectively, then after a while they won't rotate at all.
If you're buying a 2nd hand car, a rep-mobile that's done 70k on motorways is a much better bet than a granny car that's done 20k on shopping trips. Regular oil changes does the business.