Oil change thoughts- Donaldson filter & synthetic for longer intervals?

compressionignitionrules

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I don't run an idi in my driver , a 7.3 psd is my choice , but i do 10,000 km oil/filter changes with grease jobs in between. 10,000km is around 6300 miles. add aprox 2 litres in there to keep it in the safe range on rotella T15w40 . 0w40 full synthetic services use more oil than 15w40 standard rotella t . maybe 5litres or more on syntehtics.

they run same and fuel econ is same but leave more oil on the ground.

save your money and change oil more often................. standard 15w40 diesel but don't buy the budget oil!

in Oregon you will never have a "cold start":cheers:
 

chris142

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If you get it up to temp much, there shouldn't be any water.

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This. Sure lots of short trips will allow condensation to build but it will boil off on a good long drive
 

rhkcommander

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Thanks for the great input guys!

How are you testing the oil? I know some of you send samples to blackstone or marc nelson, or other oil analysis companies.

My goal is to do longer oil change intervals, while doing right by the engine, and taking some load off the starter. I usually use delo 400, would switching from that 15w-40 to a 5w-40 synthetic help with cranking that much?


Most full synthetic 10w-40 is motorcycle oil from what I'm finding... For 5w-40 I heard schaeffer supreme 9000 was good. Are there any issues with oils to look out for, or is everything pretty much good to go in our engines? I know with the trans I had to make sure to get brass safe oil.

I have read BITOG, but I'll double check their forums too. Got up to page 7 on the HDEO forum.
 
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79jasper

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If you want a better analysis, use Polaris labs.
If you want a better oil, I can put you in touch with my oil guy.

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franklin2

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All my engines are old with a lot of miles and older gaskets. With regular oil I get regular oil weeping and a drip or two here and there. If I run synthetic I get puddles. Just keep an eye on it if you decide to run synthetic oil.
 

Macrobb

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Personally, I think that a PSD(and the newer PSDs especially) are different animals - they are tighter motors, resulting in less crud in the oil.
Our IDIs are pretty 'dirty' motors, and it ends up in the oil - a lot of soot in there.

My feeling is that if you have a filter good enough to pull that soot out - and a good bypass filter like the Amsoil one mentioned would probably work, yes, you can extend the drain interval.
If you don't put a good enough filter in there, all you'll end up with is sludgy crud in places like the valve area. I've see that on a couple of motors.

Personally, I'd like to try getting a centrifuge filter, something that can filter out all those tiny-micron-sized particles. Do it well enough and you could extend the drain interval(with synthetic) a lot.

Right now, though? I use Mobil Delvac 15W40 and change it every 2500 miles. And the inside of the motor looks spotless.
 

franklin2

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I will throw this out there also; What about all the worn out injection pumps from burning waste motor oil? It's run through super duper filters and whatever you guys do to it, and it still wears out the injection pumps over time. I get it, "it's worth it for the cost savings in fuel", but where does this wear come from? This is the same oil you have in your engine, it's where you got it from correct? How long do you let this dirty oil circulate through your engine?
 

Macrobb

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I will throw this out there also; What about all the worn out injection pumps from burning waste motor oil? It's run through super duper filters and whatever you guys do to it, and it still wears out the injection pumps over time. I get it, "it's worth it for the cost savings in fuel", but where does this wear come from? This is the same oil you have in your engine, it's where you got it from correct? How long do you let this dirty oil circulate through your engine?
I'm pretty sure that the people who are wearing out IPs and using WMO tend to be cost-concious. Which means they *won't* be using high quality filters or doing things 'right', because it's expensive.

I've seen videos of someone filtering WMO with a *good* centrifuge setup, and the oil coming out of it looked new. It was clear, while the oil going in was black.
I'm pretty sure that *that* oil won't wear the IP nearly as much.
 

rhkcommander

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I will throw this out there also; What about all the worn out injection pumps from burning waste motor oil? It's run through super duper filters and whatever you guys do to it, and it still wears out the injection pumps over time. I get it, "it's worth it for the cost savings in fuel", but where does this wear come from? This is the same oil you have in your engine, it's where you got it from correct? How long do you let this dirty oil circulate through your engine?


The oil pump operates at what, 45-50 psi? The injection pump is 2000+.

Big difference between diesel and oil viscosities, etc
 

vlrd56

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I every body when you speak of 15W40,is it minéral or synthetic ?
I drive a 7,3l with around 200 000 miles
 

drfuelinstein

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If one operates a diesel engine today without an engine oil bypass filter system one is cheating one's self. The soot loading that goes on in an engine equipped with EGR is terrible. Having a bypass filter system and there are many to choose from, can do a significant job in extending engine oil life

With respect to engine oil? Engine oil volatility makes a huge difference. There are 2 kinds of synthetic oils. Fully Synthetic (Fake Synthetic) and Chemically engineered synthetic. Volatility numbers can help in identifying the difference., The lower the volatility the better the oil. For example Redline, HPL, MPT and Amsoil all have lower volatility numbers than the majority of the other oils. Engine oils mist in the crankcase and that mist is collected by ccv or pcv and redeposited in the intake system as a form of emissions control
 

Macrobb

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If one operates a diesel engine today without an engine oil bypass filter system one is cheating one's self. The soot loading that goes on in an engine equipped with EGR is terrible. Having a bypass filter system and there are many to choose from, can do a significant job in extending engine oil life

With respect to engine oil? Engine oil volatility makes a huge difference. There are 2 kinds of synthetic oils. Fully Synthetic (Fake Synthetic) and Chemically engineered synthetic. Volatility numbers can help in identifying the difference., The lower the volatility the better the oil. For example Redline, HPL, MPT and Amsoil all have lower volatility numbers than the majority of the other oils. Engine oils mist in the crankcase and that mist is collected by ccv or pcv and redeposited in the intake system as a form of emissions control
I, uh...
While I believe everything you've said here is /correct/, I'm not entirely sure it all applies.
This is the 7.3 IDI forum - these motors were built before EGR on diesels was even a thing, let alone DPF or any of the newer emissions crap.
So, we don't need to worry about any of that extra soot load(just the load from the massive ring gaps)

We also have other concern to worry about - mainly that the engines are, at a minimum, 22 years old, and unless it's been rebuilt recently, the seals are pretty worn out.
This is why running synthetics in an IDI is something to be careful with - due to the degraded seals, there's a good chance it will start to leak badly.
If the engine's always run synthetic? No big deal.
If you re-seal an IDI, yes, you can run synthetic just fine.

Also, you will find that an IDI will produce far more engine oil mist than just about any other engine out there - massive ring gaps mean massive blowby, means a constant stream of oil vapor making it's way into the intake where it is burned.
 

79jasper

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I agree with everything else you said, but egr on diesels has been out before the 7.3 IDI was made.

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Macrobb

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I agree with everything else you said, but egr on diesels has been out before the 7.3 IDI was made.
OK, I'll bet you're right... but I'm not sure what might have had it.
I know that the pickup trucks of the era didn't, that's for sure.
Big rigs maby? Trains?
 

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