Changing oil not Necessary

[Artan]

Again. Why ball bearings in the wheel of the car under high presure of weight and sudden hits to pot holes do not require grease change whereas engines need oil change.

I simply dont believe the oil sellers that we should change the oil so often. Maybe once every 1 milion miles would be true. What matters in the life of an engine is the way of driving. You can change the oil every 1000 miles but if you drive the car reclessly your engine will be destroyed.

[Patrick]

Originally Posted by Artan

Again. Why ball bearings in the wheel of the car under high presure of weight and sudden hits to pot holes do not require grease change whereas engines need oil change.

Because (most) engines use what are called "plain" bearings, which rely on a very thin film of oil between two surfaces to allow the parts to slide past each other. This requires a very high quality of oil and periodic changes to maintain that quality. If the film of oil isn't maintained, the two parts will come into contact with each other and wear will result.

Wheels use ball or roller bearings in which two metal surfaces contact each other (one part rolls along the other, like a wheel rolling down a hill) and require far less lubrication to keep them working properly.

[Patrick]

Originally Posted by Artan

I simply dont believe the oil sellers that we should change the oil so often. Maybe once every 1 milion miles would be true.

The vehicle manufacturers set the oil change intervals, not the oil sellers. In fact, many oil sellers are trying to sell products by advertising longer oil change intervals than the vehicle manufacturers recommend.

[Artan]

Patric; are you telling me that there are no ball bearing where the arrow is pointing on the crankshaft?

Check the picture below.

I know there are ball bearings at both sides of the crankshaft as well?

The vehicle manufacturers set the oil change intervals, not the oil sellers. In fact, many oil sellers are trying to sell products by advertising longer oil change intervals than the vehicle manufacturers recommend.

Vehicle manufacturers and oil producers/sellers are one, they just have different names according to me.

[UFO]

Originally Posted by Artan

Patric; are you telling me that there are no ball bearing where the arrow is pointing on the crankshaft?

Check the picture below.

I know there are ball bearings at both sides of the crankshaft as well?

There are NO ball bearings in the bottom end of an engine, and certainly not in the crankshaft and connecting rods.

Originally Posted by Artan

The vehicle manufacturers set the oil change intervals, not the oil sellers. In fact, many oil sellers are trying to sell products by advertising longer oil change intervals than the vehicle manufacturers recommend.

Vehicle manufacturers and oil producers/sellers are one, they just have different names according to me.

Come on, do a little bit of thinking before you form your arguments. Oil analysis can be very informative, give it a try.

[Patrick]

Originally Posted by Artan

Patric; are you telling me that there are no ball bearing where the arrow is pointing on the crankshaft?

Check the picture below.

YES. What you are looking at in that picture is the surface of a PLAIN bearing. It must have oil lubrication.

EDIT: You might want to read this: http://en.wikipedia.org/wiki/Plain_bearing

[Artan]

I thought crakshafts have ball bearings in there but i was wrong.

Which is stronger to heavier loads; the ball bearings or the plain bearings? which one will last longer?

[Patrick]

Originally Posted by Artan

I thought crakshafts have ball bearings in there but i was wrong.

Which is stronger to heavier loads; the ball bearings or the plain bearings? which one will last longer?

Read this: Plain bearing - Wikipedia, the free encyclopedia

and this: Rolling-element bearing - Wikipedia, the free encyclopedia

[Artan]

I see men. I thought ball bearing are stronger but according to wikipedia the plain bearings carry high amounts of load. Maybe because of the bigger surface metal to metal contact will disperse more load onto the bigger area.

This increases my believe more and more that the oil should not be changed. Because plain bearings are stronger than ball bearings.

[UFO]

Originally Posted by Artan

This increases my believe more and more that the oil should not be changed. Because plain bearings are stronger than ball bearings.

Pretty much sums up this issue.