Oil Changes: Is Every 3,000 overkill?

[bronsin]

Originally Posted by Happy Little Pony

That's the problem. You say that the car will last just as long using conventional. And I think that you are correct. And by the way, so does Toyota. It's what they recommend. But how do I prove it?

In this thread you can see that people are scared of conventional oil. Don't use it past 5000 miles. Don't use it past 3000 miles, even. In other words, conventional oil equals BAD oil. I think that this is wrong, and that a modern API approved conventional oil is quite capable of handling the lubrication needs of the 1nzfe up to 5000 miles. And even well beyond that.

So, to test my theory, I'm going to put cheap Mobil Super 5000 in my car and run that oil out past 6000 miles. Then I'm going get an oil analysis performed and see how the oil held up. I can then use this information to make an informed choice about my cars lubrication needs, not just make idle speculation. My warranty is expired. I can do stuff like this now!

And, really, I was going to get one done to see if my new air intake was doing a good job of cleaning. This just makes for a more interesting oil change and offers me some amusement in my otherwise drab life.

Tell us what the analysis is when it comes back.

I did my own test of synthetic oil comparing my mileage on my trip from NJ to AK two summers ago. 5200 miles there on conventional oil, 5200 miles back on synthetic. Gas was ~$7 a gallon in northern Canada. Synthetic oil used to claim back in the 70s it increased your mpgs. I needed all the help I could get with those gas bills! (over $100 every day)

It did nothing as far as make the car go farther on a gallon of gas.

You would think if there was anything to the claims its "better" than conventional oil they would take identical cars and run one on regular and one on synthetic until they break.

But they dont. Probably because then synthetic oil would be exposed as just an expensive excercise in mental masturbation.