M1 15w50 extended life oil, 14,800 miles, Toyota Land Cruiser results

[ekpolk]

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Is this the ultimate 'thicker is better' test?

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Not really. Coupled with the outstanding results many of our members have had using the xW-20 oils, I'd say they form the ultimate "viscosity is not as big a deal as some think it is" test.

Afterthought: please understand I mean that tempered with reason. I'm not advocating dumping an SAE 60 racing oil into a new Honda in Anchorage, or using a 5w-20 in an old air cooled Porsche, etc.

 

[Big John]

3 quarts of make up oil,which is almost 1/2 sump capacity may sway the results no???? The EP oil has more of the "good" stuff right.Check me if I'm wrong here but adding almost half the capacity through an oci can make just about any oil perform well for 15k?????? I'm having a hard time with all the praise on this one...just my 0.02....

 

[jsharp]

If you add 50% to the numbers to account for the makeup oil they're still really good for a run of 15K miles. The large sump certainly helps but my V6 Toyota holds 7 quarts thanks to the remote filter and it doesn't turn in numbers like this.

It just looks like the oil, the engine, and the conditions all work pretty well together.

 

[Landtank]

Help me understand how the makeup oil delutes the results please. I mean, when I drained the oil I can tell you there wasn't 11 quarts of it. It was short of 8 quarts actually so I'd think that since there was less than 8 quarts then the concentration would be higher than if it was at 8 quarts.

I can understand the makeup oil helping the additive number but not the wear numbers.

 

[theguru]

You first post says make up oil 3 quarts, however, your last posts says it was 3 quarts short. Have you added 3 quarts?

 

[ekpolk]

Posted by Landtank:

quote:

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Help me understand how the makeup oil delutes the results please. I mean, when I drained the oil I can tell you there wasn't 11 quarts of it. It was short of 8 quarts actually so I'd think that since there was less than 8 quarts then the concentration would be higher than if it was at 8 quarts.

I can understand the makeup oil helping the additive number but not the wear numbers.

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One factor that a lot of members overlook is that this would depend, to some degree, upon how the oil went away. If it's primarily evaporating off, I'd expect the non-volatile contaminants to increase in concentration in the remaining oil. If it's leaking away, or burning, then I'd think the concentration would stay the same.

 

[jsharp]

quote:

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Help me understand how the makeup oil delutes the results please. I mean, when I drained the oil I can tell you there wasn't 11 quarts of it. It was short of 8 quarts actually so I'd think that since there was less than 8 quarts then the concentration would be higher than if it was at 8 quarts.

I can understand the makeup oil helping the additive number but not the wear numbers.

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Over time through usage you are removing both oil and contaminates while replacing that volume with just oil. The overall percentage of contaminates decreases as you continue this process.

Think of it as making instant coffee. You use a teaspoon of coffee in a cup of water and it's the right strength. Pour 1/2 the cup out and add 1/2 cup of just water to get back to a full cup. You have the same volume again but coffee is now too weak because when you poured out the 1/2 cup you poured out both coffee and water, but you added back only water...

 

[Landtank]

So during normal oil consumption it's consuming the minerals as well. While I have a damp spot at the rear of the engine I typically do 5k oil change intervals and never had to add oil in between. This engine has an oil level sensor on it and it turns on just shy of being a quart low.

 

[jsharp]

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So during normal oil consumption it's consuming the minerals as well.

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Unless the usage is as epolk mentioned, simply evaporation. In your case though that's not likely given the usage.

That's not high oil consumption though. A quart used per 5K miles is nothing to worry about. A lot of people with much newer vehicles are using more than that. With some vehicle brands, it would be a miracle if they only used that little even when new.

 

[Tim]

Landtank

If you are leaking or burning the oil, theoretically you are losing dirty oil and replacing it with clean. This will have the effect of lowering your wear numbers. I suspect a leak will have a greater effect than burning...just a guess...some of the contaminants may remain after the lighter components burn off.

Your analysis is great. 1 quart make-up per 5k is very normal - even on the low side for a high mileage engine.

I keep trying to talk myself into going for a gonzo long OCI on my cruiser now that I have the Fumoto and it is so easy to take a sample without draining. I just have too much fun changing my oil to leave it in that long

Tim

 

[JohnBrowning]

IF it is consumeing oil then their is very little dilloution of the results. If he was topping up due to a leak or filter change that would be a different story.

 

[sprintman]

15W50is a nice mid weight weight oil. Shame so many are amazed by such good numbers. I really have to wondeb about the UOA's posted here by the American/Canadian thin weight crowd. Let's see if they can match this?
ps. I'm sure they they will

 

[jamesn]

in an 8 quart system if you drain 2 quarts and add 2 fresh quarts your iron, lead, ect numbers will drop by 25% immediately.