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In Reply to: Thicker oil is NOT best protection posted by Henkka 750i on January 28, 2002 at 02:50:15:
Unfortunately someone at Castrol or some other brand oil company started advertising that "racers" use the 20W (or heavier) stuff and now the whole world thinks that oil as thick as molassas is the only way to protect a motor. What that same person failed to mention is that these racers tear down their motors for a complete rebuild after less than 1000M. Since the rebuild is a foregone conclusion, heavier oil, wich has better shear properties at high temps (like in a racing motor) is the way to go - even though the motor is new. If you plan to tear down your motor (or if your motor is already very loose with wear) every oil change, a heavier oil may be for you too... but for those who plan to keep their existing motor or who are starting an oil regimen with a new(er) motor... go with the lightest stuff you can (start with the mfg recommended weight) and work up to the heavy stuff as you "have" to.
Kevin
Thicker oil is better protection and doesn't burn up as much as thinner oil
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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