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In Reply to: Re: Would 5/50 syn be bad? posted by Zach on January 28, 2002 at 01:15:26:
Actually the THINNER the oil the better. The whole purpose of oil - the only reason why we pour it in the engines in the first place - is lubrication. The thinner the oil, the smaller the gap where it will wnter and thus lubricates everywhere it's supposed to, and reduces engine wear.
Thick oil certainly doesn't leak from worn gaskets or worn piston rings, but it doesn't lubricate all bearings and pistons like it should.
So even in cars with a bit worn engine or slight leaks I'll rather use decent oil and add some every now and then than use cheap shitty oil without leaks and have to rebuild the engine sooner.
The main factors which decide if the engine will last for 100,000 miles or 200,000 miles:
1 .Type of oil used
2. Amount of cold starts and the revs before warming up
3. Amount of redlining
4. Type of use: highway or city
Henkka
Former Shell employee
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