New oil removes old oil anti-wear film?

[NWJeepr]

The one thing I read, presented without evidence, is that detergent levels and pH are high in fresh oil, designed to counteract the effects of use over time. In essence both are "too much" at the start, but designed to last the oil change interval and still provide adequate protection at the end of the interval. If you're running too much detergent (new oil all the time) and too high pH, it's harder on the engine than oil that is mid-cycle where pH is basically neutral and the amount of detergent has been diluted/lessened.

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[autotragic]

It's kinda true. Modern oil is detergent oil, so it strips sludge and holds debris in the oil, which is then filtered. If you have a very old engine, like very old, that doesn't have modern filtration, new oil may dislodge debris and sludge that cannot be properly filtered.

The info in the original post isn't at all relevant to our engines. If you have a 1964.5 Mustang with an original 289, you may want to use non-detergent oil, if you can find it.

They have been steadily reducing detergent levels for a while now. API-SP is safe for older engines as well.

 

[Old Dogger]

O.K., the opinions somewhat vary. Why not just keep it simple? Since it appears that you have decided on PUP, 5W30, then why not just stay with this, and use it every time that you change your engine oil? IMO..boncing from one weight oil to another, and Brand to Brand, is not helping your engine. It is a total waste of time and money, plus lack of sleep. I have used, the same brand and weight of oil in all three of our 3.6 engines, from day one, with 3000 mile oil changes. I have not had any engine oil failures caused by the engine oil that I use.

 

[autotragic]

Do you have a link to that video?

Start at 28 minute mark for what you want to know but I'd watch the whole thing.

 

[daroutergod]

Yea, not buying it. Just from a logical standpoint. Metal on metal it would have to strip any film away and leave it raw for some time, which it wouldn't because the new oil is there. Any additives would be mute at this level. And note he is talking about a flat tappet engine.

 

[jaymz]

Start at 28 minute mark for what you want to know but I'd watch the whole thing.

I don't have time to watch the entire video, but it seems he's talking specifically about ZDDP, and that has long been phased out of pretty much everything other than some "boutique" oils that are targeted at breaking in flat tappet cams which are also pretty much a thing of the past.

I still don't think that there's any significant reason to worry about it.

 

[autotragic]

I don't have time to watch the entire video, but it seems he's talking specifically about ZDDP, and that has long been phased out of pretty much everything other than some "boutique" oils that are targeted at breaking in flat tappet cams which are also pretty much a thing of the past.

I still don't think that there's any significant reason to worry about it.

ZDDP has most definitely not been "phased out".

You are free to do whatever you want, I never said otherwise. Have a great day!

 

[daroutergod]

I don't have time to watch the entire video, but it seems he's talking specifically about ZDDP, and that has long been phased out of pretty much everything other than some "boutique" oils that are targeted at breaking in flat tappet cams which are also pretty much a thing of the past.

I still don't think that there's any significant reason to worry about it.

Go to 1:01 in the video where he talks about how the lower viscosity oils are strictly for gas milage.

 

[jaymz]

ZDDP has most definitely not been "phased out".

You are free to do whatever you want, I never said otherwise. Have a great day!

Also I have to note, when people whose job it is to formulate oil at a high level then go on to share that information and then people who have no idea what they are talking about "chime in" saying things that don't even make sense it's no wonder we can't talk about oil without it devolving into a bunch of horseshit made up nonsense. It's almost unbelievable honestly.

“Phased out” was not the best choice of words, but it isn’t in common use in the vast majority of vehicles on the road when using oil that is recommended by the vehicle manufacturer.

 

[NWJeepr]

I think what bothers me is so much of this supposedly crucial knowledge about oil comes from YouTubers trying to make money based on second-hand knowledge, or companies trying to sell a product (or an idea, or a service), or supposed insiders whose agenda isn't always clear... But what they tell you seems, again, designed to invoke fear to drive you to a particular product or service or idea....

And then when anyone calls that knowledge into question, the guy regurgitating that second-hand information on the internet gets mad that you don't fully trust him or the second-hand source that was posted.

Rinse/repeat...

 

[roaniecowpony]

ZDDP is in widespread use in Mobil 1 oils.

 

[XtremeRetard]

100% fact.
Hence why good high mileage oil often continues to provide excellent wear properties. (If you check with an oil test)
Eventually its additives run out, the chains shear etc and its time to change it, but sticking to one brand is good.
Plus as above, new oil has detergent to clear out contaminants, which will strip some anti-wear stuff.
Which by the way needs heat and engine cycles to fully cure.
Which is why new oil doesn't protect better than a good used oil.

Again a good reason to test your oil. So you know when you should change it.

 

[mwilk012]

And yet, normal people will continue to get 300k+ miles out of their engines just fine without ever caring about any of this.

 

[Pape]

And yet, normal people will continue to get 300k+ miles out of their engines just fine without ever caring about any of this.

Ya we love to argue about hair splitting after all this is a forum, it purpose is to exchange with each other. Personally I think this is better than talking about the weather lol

 

[Pape]

Start at 28 minute mark for what you want to know but I'd watch the whole thing.

Nice, thanks for the point out. I guess we can roll that one up as different additive are made for different engine type, I will dig out the video on that one when I have some time.

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