mobile 1 0W40 analysis results 8700 mile OCI, 00 boxster s - 986 Forum - The Community for Porsche Boxster & Cayman Owners

saaber · 12-09-2007, 10:09 AM

Quote:

Originally Posted by 986chris

Here's what I know. 03 Sliverado 8.1 lt gas 105,000 miles I use 5w30 mobile 1. haven't changed oil in 3 years add 1-2 qts. between computer recommened changes, new filter every other time. feels just as fresh as new. Truck gets used for every thing short drives, trailering, highway. it's my own little experiment.

Quick story... once I bought a dodge van with 96k miles. Drove fine, oil looked fine on dipstick. Drove for a couple months, got sick of top-heavy feeling and sold it. New owner drove for a couple months then it threw a rod! Mechanic found 1" of sludge in the oil pan and said the oil had probably never been changed! Everything seemed fine but that was a disaster waiting to happen!

I trust the wear shown on used oil analyses and even more so those folks that have torn into engines and seen the wear and sludge buildup. There is a tremendous amount of data out there and most everyone says that earlier is better. I hope the experiment doesn't hold any surprises down the road. You are a brave man.

John V · 12-09-2007, 01:54 PM

A UOI on that Silverado would undoubtedly show lots of moisture in the oil as well as insolubules (i.e. sludge). I would never do that to one of my vehicles, even my beater 190,000 mile Nissan. To each their own.

Paul · 03-30-2008, 09:38 AM

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.

03-30-2008, 09:59 AM

Quote:

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 · 03-30-2008, 11:13 AM

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 · 04-07-2008, 06:58 PM

Quote:

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 · 04-07-2008, 07:30 PM

Your Porshe is wearing better than most.

notice that line.

And, 11K is not 20K/

Paul · 04-07-2008, 08:15 PM

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 · 04-08-2008, 04:14 AM

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 · 04-08-2008, 07:40 AM

Quote:

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.

Perfectlap · 04-08-2008, 11:45 AM

Quote:

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.