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

[John V]

Similar to my oil analysis after a 7.700 mile interval and mostly street driving. Except my iron was only 11ppm. Silicon was 19ppm. My next oil change was at 8k and had elevated levels of wear metals due to a lot of autocrossing, but not to extreme levels.

My new interval is 5,000 miles during autocross season and 8,000 miles otherwise. This is using 0W40 Mobil 1.

15,000 mile oil changes? Yeah right... if you want the motor to wear out in 100,000 miles.

[Paul]

Originally Posted by John V

Similar to my oil analysis after a 7.700 mile interval and mostly street driving. Except my iron was only 11ppm. Silicon was 19ppm. My next oil change was at 8k and had elevated levels of wear metals due to a lot of autocrossing, but not to extreme levels.

My new interval is 5,000 miles during autocross season and 8,000 miles otherwise. This is using 0W40 Mobil 1.

15,000 mile oil changes? Yeah right... if you want the motor to wear out in 100,000 miles.

I've reported this before so I'll give the short version. When Porsche tested the 996 turbo in the US, they drove it 100,000 miles in the LA area on 87 Octane gas and did not change the oil at all, just added it as needed. When the motor was torn down, it was still within new tolerances. This was presented as a tech session at a Porsche Parade.

[Brucelee]

Originally Posted by Paul

I've reported this before so I'll give the short version. When Porsche tested the 996 turbo in the US, they drove it 100,000 miles in the LA area on 87 Octane gas and did not change the oil at all, just added it as needed. When the motor was torn down, it was still within new tolerances. This was presented as a tech session at a Porsche Parade.

I would love to see the data on that. I can tell you that ANY oil is shot at 20K miles and the 100K is a joke in my experience. Now, if the car was using a qt of oil per say 1000 miles, then, well you get the picture.

If you can provide details on this story, I would appreciate it.

[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.

[AUDIOGUY]

When I owned BMWs, I always wondered if they tauted longer than average oil change intervals because so many of their cars had BMW paid maintenance packages. You would figure one oil change per year per car is much less costly than two.

Just a thought.

I change my oil once a year in the summer at about 7k mile interval.

[John V]

Obviously owners are free to do as they please with regard to oil changes. My oil reports don't support the notion of running the oil longer than 10k with my driving.

The factory only cares about you getting through the warranty period. Once you're out of that period they couldn't care less how long your engine lasts because they're not paying the bill for replacement - you are.

[Brucelee]

I think the distinction that has not been made so far is wear vs. engine melt down.

I would never suggest that the Boxster IMS issue is related to dirty lubrication. We know that is a design issue.

Now, if someone wants to reduce nornal wear on an engines internals (for whatever reason) they should care about the quality of the oil, as that is a major factor involved in wear, along with the intrinsic engine design.

Again, used oil analysis does not lie. If even the best synthetics are shot north of 10K miles, these oils cannot be doing their job and extra wear will result.

The only issue is whether anyone cares. Porsche would not be concerned because this wear would not generate any issues during the warranty period.

However, the flip of the coin is, if you Porsche engine blows up under warranty, you can BET they will be checking your maint. history to see if you changed the oil according to their rec.

[saaber]

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]

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]

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.