Non-Detergent Motor Oil

[Scott H in Wheaton]

Originally Posted by Mart

My engines tend to run on a through flow constant loss system.

But what if only the clean oil leaks out, leaving all the dirt behind?

[JSeery]

Originally Posted by Scott H in Wheaton

But what if only the clean oil leaks out, leaving all the dirt behind?

But he uses detergent oil so the dirt is always suspended.

[Scott H in Wheaton]

Originally Posted by JSeery

But he uses detergent oil so the dirt is always suspended.

Maybe Scully can get him some OxiClean to go with that detergent

[ford38v8]

What time do the dancing girls come out?

[rotorwrench]

Originally Posted by DD931

Mac's et. al. sell it because people buy it. That's not where you should be going for advice on how to care for your engine!! I don't know why you would use non-detergent oil for break-in, either. What property does non-detergent oil have that makes it desirable for break-in use? Wouldn't the detergent action of the detergent oil keep fine wear particles in suspension better?

Non-detergent oil allows the rings to seat with the aid of the generated particulate where the high spots in the cross hatch are getting sheared off. Detergent oil actually carries away particulate that can be useful during the bedding in process and holds it in suspension. That isn't always a good thing while bedding in an engine. Particulate in suspension is what may damage your bearings to some degree. I'd rather have it in the bottom of the oil sump than flowing along with the oil. Once the engine is bedded in there is no further use for a non-detergent oil.

In aircraft engines, it is used just for that purpose and is recommended by the manufacturer unless it will be harmful to some other component like a turbo charger. The first oil change is performed after 10-hours then at each 20 to 25-hours after until the engine has reached 100-hours since overhaul. Back when channel chrome plated cylinders were in use, the piston rings would never break in if detergent oil was utilized.

There is a reason that the crankshaft has those sludge chambers inside the crank pins. The heavier particulate in the oil is thrown outward by centrifugal force so it won't venture into the bearing areas. This is a good reason to make certain that these chambers are thoroughly cleaned out during the overhaul process.

These old engines were intended to be maintained by regular oil changes at much lower scheduled mileage intervals than we use on modern vehicles due to the bypass filtration system. The oil being changed while still hot after a good run is what gets most of the particulate out. The sump screen and the filter just get the big chunks. The rest of it stays in suspension until you dump it out of there. As was mentioned previously, the suspended particulate is so microscopic that it generally won't even affect the oil film build that is being forced through & between the bearing surfaces. If the particles get large enough to scuff or scratch the bearings then something is already wrong.

[ford38v8]

Sponsored Links (Register now to hide all advertisements)

Rotor wrench: Good writeup!

[oldford2]

[48 coupe]

Yup, olford said it all .If it weren't about oil it would be sparkplugs. Wouldn't miss it for the world.

[FrankWest]

Originally Posted by oldford2

Very funny! I love it!

with all this crap, I feel like I have
metamorphosized

into a durable engine looser.

https://www.youtube.com/watch?v=8QWPIcGjjZo

[Ol' Ron]

Well I have to agree with everything that has been offered here, explaining the use or dis use of non detergent oil. I ave to agree with aloft them except one. Any person running a $5000 dollar engine with out a full flow oil filter has missed the point of it. Yes in the old days changing the oil frequently, was the only way to keep them cleam

[TJ]

Originally Posted by Mart

My engines tend to run on a through flow constant loss system.

If it's not leaking you are out of oil.

[billfish]

I buy non-detergent 30 sae at NAPA.

[Ronnie]

Here is all you ever want to argue about. "LOL" looks like 1391 posts

https://www.google.ca/search?hl=en-C...pe=&as_rights=

R

[Binx]

If you have a Tractor Supply nearby here's a source for 40W non-detergent. Not big name brand but still SAE.

http://www.tractorsupply.com/en/stor...rm/SAE40%20oil

Lonnie

[hotrodal1]

Question What do I retorque my heads on a 40 Ford iron heads? Pounds wise?

[hotrodal1]

also what should I retorque my heads on my 40Ford v8 with iron heads

[JSeery]

See "start a new thread" at the top left. Your post is totally off topic and will get lost here. And welcome to the barn!

[40 Deluxe]

A note on bypass oil filters: The original owner's manual that came in my '40 Ford says to change oil every 2,000 miles if no oil filter and every 5,000 miles if equipped with the optional bypass filter. So Ford evidently thought a lot of this filter! Since my car just recently turned 36,000 miles, theoretically it is on only its 7th oil change!

[slowforty]

Strangely enough you can find it at Wal-Mart

[Ol' Ron]

Ford also said 10 wt in winter and 30wt in summer.