mobile 1 0W40 analysis results 8700 mile OCI, 00 boxster s

[Paul]

I changed my 0w-40 Mobil 1 and factory filter yesterday at 17.5 months and 11,232 since the last change.

I'm sending in a sample for analysis including a TBN study.

I will post the results when available.

Originally Posted by Paul

I changed my 0w-40 Mobil 1 and factory filter yesterday at 17.5 months and 11,232 since the last change.

I'm sending in a sample for analysis including a TBN study.

I will post the results when available.

Paul, did you need to add any oil during the 17.5 months?

[Paul]

None, it never left the "full" mark. Not bad for a 7 year old car with 67,700 miles that's driven harder than most.

[Paul]

Originally Posted by Paul

I changed my 0w-40 Mobil 1 and factory filter yesterday at 17.5 months and 11,232 since the last change.

I'm sending in a sample for analysis including a TBN study.

I will post the results when available.

The results are in. As I've said before driving a Porsche harder than most doesn't seem to hurt it. I've been flooring and shifting near redline every Porsche I've owned since 1974 without an engine failure. I take my cars on 5000 mile 3 week vacations.

So much for Porsche not knowing anything, the recommendation below is to change my oil even later!

[Brucelee]

Your Porshe is wearing better than most.

notice that line.

And, 11K is not 20K/

[Paul]

Yes please note that my car is wearing less than most. Will you at least admit that most Porsches are not driven like mine, and they, based on this report are wearing more?

I assume you will say this is not evidence either.

[John V]

I can't see your UOI because photobucket is blocked from this computer. But I'm guessing your wear was below the universal averages. That's great, but mine was a decent amount above the universal averages with a 10,000 mile interval, which is why I backed off to 8,000 miles. I'd venture to say I use my car harder than most as well.

[Brucelee]

Originally Posted by Paul

Yes please note that my car is wearing less than most. Will you at least admit that most Porsches are not driven like mine, and they, based on this report are wearing more?

I assume you will say this is not evidence either.

There is no need to debate anything here. You need to change oil consistent with how you feel about the issue, cost-benefit trade off etc.

From my point of view, it makes little or no sense to run any oil more than 7500 miles in an engine as expensive or fragile as a Box 6. That is simply my point of view, based on how I assess risk and reward.

If you are comfy running your oil beyond that, that is fine. Your money, your car.

It is all good.

I should point out that each car is different. We have seen UOA on BITOG that suggests that M1 is gone by 7500 miles. So, in those cases, it would not be wise to try to extend.

But, a few cases carries no statistical weight so, who knows. I wonder, would you run your car to 20K on any oil? I wouldn't.

[Lil bastard]

As Bruce says, there is great variation between these individual engines.

Not only that, but you're making your case on an assumed linearity of the results, which is probably not the case.

Your oil may look fine at 11k, and be all in by say 13k (or any mileage really).

You'd have to sample the oil at regular intervals to be certain, and even then because the hrs. on the engine increase thru the testing, it could be the asociated wear and not the oil which is causing the effect.

Don't worry... be Happy! If you're not worried going 11k+ on your oil, that's great! I don't think I'd share the same feeling for my car.

[Brucelee]

Originally Posted by Lil bastard

As Bruce says, there is great variation between these individual engines.

Not only that, but you're making your case on an assumed linearity of the results, which is probably not the case.

Your oil may look fine at 11k, and be all in by say 13k (or any mileage really).

You'd have to sample the oil at regular intervals to be certain, and even then because the hrs. on the engine increase thru the testing, it could be the asociated wear and not the oil which is causing the effect.

Don't worry... be Happy! If you're not worried going 11k+ on your oil, that's great! I don't think I'd share the same feeling for my car.

Good post. Moreover, the cost of testing could be put towards the cost of fresh oil!

[Paul]

Originally Posted by Brucelee

There is no need to debate anything here. You need to change oil consistent with how you feel about the issue, cost-benefit trade off etc.

From my point of view, it makes little or no sense to run any oil more than 7500 miles in an engine as expensive or fragile as a Box 6. That is simply my point of view, based on how I assess risk and reward.

If you are comfy running your oil beyond that, that is fine. Your money, your car.

It is all good.

I should point out that each car is different. We have seen UOA on BITOG that suggests that M1 is gone by 7500 miles. So, in those cases, it would not be wise to try to extend.

But, a few cases carries no statistical weight so, who knows. I wonder, would you run your car to 20K on any oil? I wouldn't.

The ongoing discussion in which you challenged me to do an oil analysis, centered around engine wear. I drive mine hard, and the test you asked for says it is wearing less than average, which goes against your explanation of physics.

[Brucelee]

Originally Posted by Paul

The ongoing discussion in which you challenged me to do an oil analysis, centered around engine wear. I drive mine hard, and the test you asked for says it is wearing less than average, which goes against your explanation of physics.

Oh, we are back to THAT again.

Gee, I didn't know.

I don't think you can revoke the law of physics by way of a couple of used oil analysis.

But, you can try!

[Perfectlap]

Originally Posted by Paul

Yes please note that my car is wearing less than most. Will you at least admit that most Porsches are not driven like mine, and they, based on this report are wearing more?

I assume you will say this is not evidence either.

How diligent are you up in WI about keeping the RPMs low when the oil is up to temp? It seems to take my car about 5-10 minutes before the temp is right until then I always short shift.

also, do you not change the filter either when you go that long without an oil change? I'm thinking about leaving the oil but changing the filter 3 times a year.
I last changed my oil in July and I've driven about 8K miles. I'm going to change it this weekend.

[Paul]

Originally Posted by Perfectlap

How diligent are you up in WI about keeping the RPMs low when the oil is up to temp? It seems to take my car about 5-10 minutes before the temp is right until then I always short shift.

also, do you not change the filter either when you go that long without an oil change? I'm thinking about leaving the oil but changing the filter 3 times a year.
I last changed my oil in July and I've driven about 8K miles. I'm going to change it this weekend.

Yes I never exceed 3000 to 4000 rpms for at least 10 miles. I changed the oil filter with the oil, my owner's manual says every other oil change.