I drive my 928 maybe 1k-1.5k miles a year and change the oil and filter every year. My question is since I change the oil every year given the low miles can I just change the oil and not the filter since the oil is still clean when I change it. I would remove the oil filter and dump the old oil out and then reinstall and put fresh oil in.

I am asking this b/c the weather is nice today and it has been a little over a year since her last oil change.

 

Synthetic? Drive it.

 

I use conventional oil. I have read about the oil getting acidic over time and dont want to damage the engine by leaving the oil in for too long.

 

I would change both. Your 928 deserves it.

 

If i had one sitting here it would be a no brainer to change it, but i have to order one and then wait a week to get it. kinda PITA b/c I cant just run down to autozone or advance and get a Mann or Porsche filter.

 

Here's how I would rationalize it. You should change the oil while it's warm and stirred up. The only way to do that is to run the car.
So take it out and have fun with it today, then drain the oil this evening when you get back. Then order a filter and change that later. Win/win situation.

 

^

Ta da!

I thought the benefit of synthetic was that it could sit for a year and still do its job as well as go farther mile-wise between changes. Maybe conventional wisdom has changed?

If I were you, I would change the oil, leave the filter in, go for a drive. Buy several filters and never be left without one again.

If your filter is on loose enough that you can remove it without damaging it, you can even drain the old oil from your filter and pop it back on.

 

Years ago, when I used to hang out with by buddies who worked in filling stations, the common practice was to change the oil filter only every other oil change. I don't think they even removed the filter and drained it. They just put about a quart less oil in on the oil change without the filter change.

Personally, I would do just what you are asking about. I would change the oil filter only every other time and draining it and putting it back on sounds reasonable. In fact, with the very low mileage you are driving, I may not change the filter except about every third or fourth time.

It seems intuitive to me--avfer all just what is the filter supposed to do, but filter? When it gets full of particles that have been filtered out it ougnt to be changed, but since your oil appears clean when you change it it seems pretty clear that the filter has had very little to do for a year. It seems such a waste to remove and throw away a filter that has had so little to do.

Does this help?

Jerry Feather

 

Thats what i was thinking. I just wanted to bounce it off others to see what they thought. Thanks Jerry.

 

Let me understand this.

We have an $80,000 car that gets an oil change once a year.

We are trying to decide if it is OK to save ~$7 by not changing the oil filter during an oil change?

We just wasted enough time to do a lifetime of oil changes.

 

You could change the oil and leave the filter alone. There's a quart in there, but so what?

 

Why not just go buy a filter at the local parts house. I know NAPA has filters. Unless you are loyal to a certian brand of filter that's what I would do.

Enjoy your nice day. I'm getting snowed on today!

 

First i think one consideration has to be taken , that is how is this car driven??
1, Easy street miles?
2, Lots of DE events?
3, Raced on the the weekends?

Note: If the car only sees the #1 condition then....
(if the other 2 or 3 then a yearly change might be beneficial)

I would not be dumping the old oil out of the filter as this wont remove much if any dirt , it will remove about 2/3 of a QT of oil, but you may risk contaminating the feed side with dirty oil, best to leave the filter alone till it can be changed, since you live in a more temperate part of the country I would also leave the oil alone and drive the car till you get 3000 miles then change both of them oil/filter.
Since you see that your oil is still clean and there isnt freezing temps that the oil has to deal with, you may be changing the oil too soon.
Its the heat cycles that wear out the protection package in the oil.
Sometimes less is more

 

Who paid $80,000 for their 928 beyond the original owner?

I have a $10,000 car (90 928 S4) and I will be changing the oil and filter every 15,000 miles. I run full synthetic. I remember some discussions I had (and subsequent experience) with an API engineer. We were talking about synthetic oils that I was running at the time in my Merkur XR4Ti. He told me I would have no problems going 25,000 between oil changes. So I didn't. I ran the car for 10 more years, put 180,000 more miles on it and even had an incident where the water pump failed while pulling a trailer and I locked up the engine.
I let the engine cool, put a new pump on and drove it for another 50,000 miles. Never burned (or leaked) a drop of oil beyond a slight valve cover leak that I fixed.
I beat the **** out of that car. Had 14 psi of boost running it (7psi was stock for auto), alcohol/water injection and can't tell you how many times I ran it for an hour at over 100 mph while driving across Utah, Montana, etc. Constant burnouts from a stop and I swear the throttle only had two positions, on or off.

If that piece of crap engine (Turbo 2.3L 4cyl Ford) can go 25,000 miles between changes (oil and filter) on full synthetic, have the crap beat out of it, overheat to the point of lockup and still last for 180,000 miles with no problems, I think we can run for quite a long time on our super car engines between changes. It is my belief many of us are still indoctrinated in the 3,000 miles and change that was drilled into us for so long.

I even have a friend who had a Ford Escort (dating myself). He never, ever changed the oil or filter. Car had 200,000 miles on it when he traded it in. Didn't have any issues. Just added oil as needed and drove it.

My 2 cents

 

We didn't waste the time it was going to take to get the new filter which was going to be $10 or more and not $7. That was going to be about a week.

What we actually have is a car that was about $60,000 or so when it was new but which none of use here that I know could have bought when it was new. That is probably why I have never seen anyone on this list, or the others, who is a first time owner. Now when you can buy cars just like this they are more like $8,000 or $10,000. And, that is why many of us have them now. That's why many of us are doing our own oil changes and buying our oil at Sam's club or similar. That's why we are not too interested in wasting $10 for the waste of an oil filter that has not had an opportunity to do much filtering. That's why we tend to realize that when there is some alleged chemical change in the oil over time we realize that the oil filter is made out of material that does not change over time and does not loose its ability to filter the oil just because of time.

Jerry Feather