Phosphorus is a key anti-wear component in motor oil and is usually found in motor oil in the form of zinc dithiophosphate. "All the current gasoline categories (including the obsolete SH), have placed limitations on the phosphorus content for certain SAE viscosity grades (the xW-20, xW-30) due to the chemical poisoning that phosphorus has on catalytic converters. Who'd have thunk it.but here's another one It's from a british site but the info is good and to the point. Here's a link to one of the best informative sites on the subject without it being "scewed" by someone trying to sell you one or the other. Pretty much all of them have sludge removing capabilities since the 80's. Enhanced shear properties are also in diesel oils. It also has a quality that prevents it burning off as quick.so the chance of running low is diminished on a long run. My personal opinion would be to do an oil change every 20-25 hours use a detergent oil.that's what it is for.I'd like to recommend the 15w40 diesel oil because it runs quieter has detergent other sludge reducing properties. I'll follow along here and see what others have to share. I have not tried multiple oil changes as others have mentioned in this thread. Perhaps a flush with diesel and oil 50/50 and run it for a minute. That could also mean that I'm just not getting all of the old oil out of the pan. After I change the oil it looks a little dirty on the stick the first time it's run. I do know that she's about 40 years old though, so it's possible. To be honest, I don't know that I have sludge in the pan. So, if in doubt, I'd consider changing the oil more frequently. There was a time when the oil filler caps were just covered in it.it was a pretty good indicator of what the rest of it would look like ie top pans, base pan etc. Frequency of changes and better oils have pretty much eliminated sludge from what I used to see as a kid playing with engines. It has been a long long time since I've seen sludge in a base pan. Now, the question is how would I scrub the base pan without removing the engine or running the engine.might be able to get in through the reversing gear cover and do something with it.but it would be difficult without removing half of it and even then you wouldn't really know how good a job was done. That's just me and I'm sure some guys here with more experience would and can justify how it might be advisable to do so.I have no problem with that either. The part of this I wouldn't do is run the engine. Generally, if there is sludge in the bottom of a pan it can be cut with any light petroleum product. There are cases where emulsified oil may have to be cut with lighter petroleum products to remove it from a base pan. The engine was no better than other cummins engines of the same type, but the maintenance schedule keeps wear down. I've never added oil between changes and I'd go anywhere in it. I could go out and jump on her now and she would smoke 'em. I change mine every 5000 K.the truck has almost 280,000 miles on it and is not even a bit tired. Just an example for ya: My dodge cummins recommends oil change every 10,000 miles and holds 12 quarts.that is on the safe side and the engine manufacture knows that. Again, I like my 15W40 but will never say too much about what oil anyone puts in an equent oil changes make all the difference in the world on engine life. For the cost of oil and less than an hour's work it's pretty good insurance. When I check the oil on my dipstick now, after doing this for about 5 yrs, I have to look close to see where the oil is because it is so clean. Once you do multiple changes at the 20-25 hrs mark you will notice the oil won't be as dirty. I'm going for a sail tomorrow, so I'll motor out for a change and see if it jumps around. The pressure held steady right around 40. I don't trust these kind of claims, up I guess it can hurt. I figure this will be my last change until haul out in about 6 weeks. I used a 30 weight for high mileage by penzoil that claims to remove 40% of sludge with the first change. Changed the oil yesterday, solo, son sleeping, so didn't remove the sensor.
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