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Mobil 1 0/40?
cookie replied to axxiom's topic in 1990 to Present Legacy, Impreza, Outback, Forester, Baja, WRX&WrxSTI, SVX
If it has always had synthetic you should not have the seal issue and maybe you might pick up a tiny bit of mileage. Let us know how yours acts on it regarding piston slap (louder, quieter, don't have it), and how it affects fuel mileage. -
When I got my 99 Forester it had a tiny tick on start up. As the mileage wore on the slap stayed longer and longer. Then it started on the second starting of the day and stayed until the car reaced normal operating temperature. By this time it was over 100,000 miles, stabilized and did not seem to get worse unless it was very cold. I think by now Subaru must be fitting upgraded pistons. I would also love to hear more about this from someone who knows.
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My understanding is that Mobil 1 is fully synthetic. Any oil is better than no oil. I have not heard of problems from mixing as some folks mix up thier own anyway. If you can I would stick with the synthetic. If not dino will probably run just fine. I have run nearly all my cars on dino for over 40 years. You can switch with no ill effects. The only real reason to use Mobil 1 is to prevent a tiny bit of wear and perhaps improve your fuel mileage a tiny bit. I am not sure the extended change interval is going to make up for the extra expense of the oil at this point.
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Thanks for the input Bratman. I am glad to hear from somebody who has tried 15-50. I agree whith you that this stuff really flows well. Timeing the tap this morning was 10 seconds. It was mild and rainy, as soon as it splashs some oil around the tap is gone. It seems to stay on the pistons all day, but after 10 hours at night it leaks off, (at least this is what I think is happening). It does seem like 10-15 seconds of slap has got to be better for the motor than 3 minutes or so. I wonder if running the stuff from new would have prevented it in the first place? You are right and I am going to stick with this stuff unless I get some bad effects down the road. I think my engine is fairly clean as it has had fresh dino every 3,000 miles from new. I might change out the Mobil 1 at 3,000 this first time to be sure, or sooner if it gets dark and starts to look ugly.
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It will be interesting to see what effect diesel spec oil has, and I agree that is great oil. As a former fleet mechanic I have poured in many a gallon of diesel oil. I like the idea of measureing the sound before and after as it will give a much better comparison than my rolling the windows down when I start the car. I probably look pretty silly out there in the morning with my windows down, everything noisy off, and watching the second hand of my watch.
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Blitz, I did not really think the slap would disapear, but years ago when I used to re-ring engines and hone the heck out of them they usually slapped. A heavier oil would quiet it somewhat, but not eliminate it. That seems to be exactly what I have here. This is a bit of an unexpected side effect as I did not expect as much change as I got. It does make me wish I had bit the bullet and tried this a couple of years ago, but all the stories about bad experiences with leaking seals put me off. At this point I wonder if this would work as well for other folks in mild climates or if this oil just works well in the particular engine in my car. I was talking to our head of training today and he is running Dello Diesel oil in his gas van. This is working well for him as he added it when the car was not very old. It sure does keep his engine clean with those high detergents. I usually run exactly what the manufacturer reccomends for no surprises. In this case it is yet to be seen how it affects mileage long term, if the slap stays quieter or gets worse,how much oil it burns, and if it affects valve gear. My fingers are currently crossed.
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mileage. Today I got the best mileage I have seen. 25.77 mpg. This is just one tankfull and over a holiday weekend so it may not be representitive. This is about 1 MPG better than I saw before the oil change.This is not what I expected which would have been a slight decrease, but one tank means nothing. I certainly agree that oil this heavy may not be the ticket in a cold climate, but it seems to be working OK here. I also expect my slapping could easily be much worse in a colder climate.
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to never have doubted that your icon was a tube. My tech stopped with the Fender Twin Reverb. I imagine this guy just has the usual piston slap. The dealers have been good at finding and fixing the knock from the tensioners around here. There is a service bulletin on that one. I think the bulletin on the piston slap goes like sargent Shultz..."I hear nothing!"
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I guess I have always thought Subaru shortened the skirt to reduce friction,there is room for the counter measure piston which I have been told has a slightly longer skirt. I have never seen one myself, so if anyone has please chime in here.I have seen pistons in the past that had extended skirts notched for the rod to prevent slap. Teflon buttons are also possible. I have never heard of a Porsche owner complaining of piston slap, so it seems possible to make a non slapping boxer.
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for along time holds very hard. Just a propane torch will help it let go though. I use the blue if I am going to remove it on a regular basis. If I am installing it forever red is fine. This is one of the times that it does not hurt to follow the directions because that bolt is hard to get off anyway.
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but the sound you hear is when the piston skirt slaps into the cylinder wall. This is the same thing these short skirt pistons are doing in 2.5 Subarus. The slap is the piston skirt hitting the wall. I have couple of hundered miles on the experiment now and will probably fill up tomorrow as I will put another 50 miles on it tonight. I look forward to seeing if gas mileage changes one way or the other, or stays the same.
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OBD 2 DTC's
cookie replied to AlexK's topic in 1990 to Present Legacy, Impreza, Outback, Forester, Baja, WRX&WrxSTI, SVX
In a pouring rainstorm that was like a solid sheet of water. I got a code reader and cleared the code and it has not come back. I figure the cat was either cooled so much by the water, or it misfired in the rain. Just for fun I'm seeing how long it takes to return if it does. -
on the 2.5 pistons. But diesels slap for years with no damage. I still think there must be slightly less wear if the slap is less. I am not sure if my noise is reduced because of the oil staying put better, or if it is just thicker. last night the temp was low 40s which is cold for here. I had slap until the oil pressure came up that was quite noticeable, about 15 seconds. It then quieted down until you could hardly hear it.Before I would have had slap until the engine temp gauge came up to halfway. This makes me think an interesting experiment would be to put straight 30 weight dino in a 2.5 with piston slap and see what happens. Since I just paid big bucks for the Mobil 1 I won't be trying this anytime soon. Since several of you have tried the lighter synthetics with no noticeable difference in slap this makes me wonder what the difference is. The Mobil 1 in my BMW seems lighter for the given weight than dino. On to the mileage test which starts today. No perceptable difference in cranking speed for the starter, but it is not that cold here.
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Gnu and I just sold a 93 wagon with 185,000, new clutch, good paint, new brakes and clean body and paint for $2,200. This was very top dollar for this car around here from what I see. The thick file of maintence records and the way the car ran perfectly sold it. Check Craigslist from different areas to get a feel for it. I like CA bodies on cars myself as there is no salt used here. I suspect Texas Subarus are much the same.
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That was what was in my BMW from new. It must have worked fairly well because I got a nice chatty note from the Blackstone lab guy on my last oil test saying "your M roadster is looking good." I do think that the dino oil will work fairly well, the semi synth is OK, and the full synth is just a bit better. One of the questions I had for the synthetic oils were if they would justify the extra cost. Quieting my piston slap will go a long way toward this in my Subaru. The other thing I am concerned about is that my Forester always uses a bit of oil. When I go on a long high speed trip useage goes up, otherwise it is about a quart of dino 10-30 to an oil change. One concern I have is how much synthetic oil will it use between changes? At over 100,000 miles I have an engine with some wear on it, and usually a worn engine does a bit better with a thicker oil in a moderate to warm climate. On the BMW I just did not want to go to the dealer all the time for my oil. I can get Mobil 1 pretty easily and I can just keep mobil 1 on hand now. It would not hurt either car if I top up with either weight. On my BMW no difference in operation or mileage was discernable with the change from semi to full synthetic.
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On a very cold start I can hear a bit of slap that goes away quickly. I agree that the thicker oil is probably sticking on the pistons better. I also agree that it may affect my mileage and I will be measureing that over the next few fill ups. So far no leaks. It is hard to really measure piston slap by ear, but my guess is about a 90% reduction. On second starts I had easily heard slap whenever cold. This is gone completely. This also may not be an option for very cold climates as the oil is much thicker, which is what prompted me to try it.
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I have been toying with the idea of switching my 113,400 mile Forester to synthetic for some time. Since I have new seals that was not an issue for me. I recently switched my BMW from BMW semi synthetic to Mobil 1 and was pleased with the results. I decided to try the heaviest weight Mobil 1 I could get since my Subie has high miles and it's not very cold in the SF area. I have only had three starts since the switch so no long term results, I'll keep you guys posted especially if I blow it up. Either I've gone deaf or I have lost my piston slap. I was just down in the garage starting the car needlessly to hear it again. I can always hear it slap clearly in the garage here. I have no idea if this is going to work long term, it seems too easy. If it was this easy why wouldn't Subaru do it? I also have no idea if this will work for folks in colder climates.