mobile 1 15w50 full synthetic

[Jeevan]

I the other day, I have been to Walmart, I saw the crazy offer of about 25$ per gallon on 15w50 mobile one full synthetic race oil. is this worth a shot on Audi A4 quattro with 145k miles? Does this oil meets VW minimum spec?

I am more interested in suggestions from people who have been using it for a long time now.

[SilverStargazin]

absolutely not. 5w-40 only.

[aluthman]

absolutely not. 5w-40 only.

You obviously have no idea what you’re talking about...

[aluthman]

I the other day, I have been to Walmart, I saw the crazy offer of about 25$ per gallon on 15w50 mobile one full synthetic race oil. is this worth a shot on Audi A4 quattro with 145k miles? Does this oil meets VW minimum spec?

I am more interested in suggestions from people who have been using it for a long time now.

I have used it but would not recommend it in cold weather. It would be good for hard driving in hot weather though. If you don’t need a heavier oil for a track day or similar, I would stick with a 40 weight oil. Most people typically run 5w-40 or 0w-40, but 15w-40 would be fine also for warm weather.

[Theiceman]

That oil is specifically designed for flat tappet motors and has high levels of zddp. This is why it is designated a "race oil." That is how they got around the reduction in zddp for class j oil's that is known to damage catalytic converters over the long term .
Over the short term this oil will be fine in hot weather climates and provides excellent anti wear additives.
Wish it was on sale where I am as i would put it in my old Porsche ( no cat)

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[aluthman]

I’d venture to guess that at least 40% of the people on this forum no longer have a cat... lol

[Jeevan]

That oil is specifically designed for flat tappet motors and has high levels of zddp. This is why it is designated a "race oil." That is how they got around the reduction in zddp for class j oil's that is known to damage catalytic converters over the long term .
Over the short term this oil will be fine in hot weather climates and provides excellent anti wear additives.
Wish it was on sale where I am as i would put it in my old Porsche ( no cat)

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Walmart near my house always has 0W40 and 15W50 around 23 to 26$ all the time.


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[vce1232000]

I’d venture to guess that at least 40% of the people on this forum no longer have a cat... lol

yep...........

[Jeevan]

I respect Mother Earth. I won’t ever delete cat


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[SilverStargazin]

You obviously have no idea what you’re talking about...

here to discuss man, no need to be mean. It doesn't really get warm in the PNW so i guess we agree. I've also used it and would not recommend it.

[Brillo]

Adam is probably right about the fraction polluting the air with cat deletes. I'm just old enough to remember what it was like flying into LAX and Denver (and more recently Bejing) which were barely visible due to the brown stagnant cloud hanging over these cities.

On point though, there is absolutely no reason to use 15W-50. Much harder to pump on cold startup even in a warm climate and too thick at operating temperature. Higher viscosity does not equate to better bearing protection or reduced wear. It is also well-known in engine lubrication circles that the greater flow of oil will not only supply superior lubrication but also be more effective at cooling critical engine bearing locations at operating temps. Keep in mind that the viscosity of a 0W or 5W-40 oil at 100 degrees C is substantially lower than a 5W oil at room temperature, and you are asking about starting up cold with a 15W oil. Makes no sense to me. What is your logic?

[Jeevan]

Adam is probably right about the fraction polluting the air with cat deletes. I'm just old enough to remember what it was like flying into LAX and Denver (and more recently Bejing) which were barely visible due to the brown stagnant cloud hanging over these cities.

On point though, there is absolutely no reason to use 15W-50. Much harder to pump on cold startup even in a warm climate and too thick at operating temperature. Higher viscosity does not equate to better bearing protection or reduced wear. It is also well-known in engine lubrication circles that the greater flow of oil will not only supply superior lubrication but also be more effective at cooling critical engine bearing locations at operating temps. Keep in mind that the viscosity of a 0W or 5W-40 oil at 100 degrees C is substantially lower than a 5W oil at room temperature, and you are asking about starting up cold with a 15W oil. Makes no sense to me. What is your logic?

I know it wouldn’t make sense but My car is burning about 1/2 quart every 3k miles. I just want to try higher weight oil to see it I can get better protection for my old engine and turbo.


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[vce1232000]

I know it wouldn’t make sense but My car is burning about 1/2 quart every 3k miles. I just want to try higher weight oil to see it I can get better protection for my old engine and turbo.

Normal oil consumption level .....

[Jeevan]

Idk now a days I am Turning into an OCD withrespect to cars lol


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[vce1232000]

I respect Mother Earth. I won’t ever delete cat

I do my part. I do recyclable trash......

[Brillo]

I know it wouldn’t make sense but My car is burning about 1/2 quart every 3k miles. I just want to try higher weight oil to see it I can get better protection for my old engine and turbo.

Let us know how that works for ya. BTW, how are you going to assess "better protection" of your engine and TC? Your oil consumption rate isn't too bad.

[Jeevan]

Let us know how that works for ya. BTW, how are you going to assess "better protection" of your engine and TC? Your oil consumption rate isn't too bad.

Oil analysis before and after


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[Brillo]

I do my part. I do recyclable trash......

Excellent vce. I don't generate any trash, but my wife compensates in spades.

[Brillo]

Oil analysis before and after
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OK, good. Post results!!

[Kevin C]

I’d venture to guess that at least 40% of the people on this forum no longer have a cat... lol

They have a dog?




Yea sorry... that one was just too easy.

[aluthman]

here to discuss man, no need to be mean. It doesn't really get warm in the PNW so i guess we agree. I've also used it and would not recommend it.

Making an absolute statement is not exactly discussion. I also wasn’t being mean. Making a blanket statement that you can only use a single viscosity oil is just showing ignorance of the subject.

[audilove3]

that is OCD if you actually gonna send ur oil to a lab hahah

Oil analysis before and after


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[EvolutionArmory]

Running a higher weight isn’t going to slow down your oil consumption.

Fixing your PCV, valve cover, piston rings or turbo probably will though.

It’s better to try to isolate the source of the problem and fix it than it is to try to slow it down or cover it up. There’s no need to run anything other than what Audi recommends. 0W-40 or 5W-40 works just fine.

[Theiceman]

that is OCD if you actually gonna send ur oil to a lab hahah

I dont agree with this at all. OA is an integral part of good engine management. You may e right on this general POS engine, but when it costs over 25k usd to re build some engines, OA is a very good thing to do annualy ir semi annualy

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[Jay-Bee]

that is OCD if you actually gonna send ur oil to a lab hahah

You wanna get really OCD about oil check out bobistheoilguy or tdiclub forums lol.

I've been trying to find a lab for western Canada, some CAT heavy equipment shops will do oil analysis. I've got only 50K kms on a brand new engine and would like to monitor it's health.

[Kevin C]

Mobil 1 comparison chart. https://mobiloil.com/~/media/amer/us...pecs-guide.pdf
15-50 has A phosphorus level of 1300 and a zinc level of 1200. The FS 0W-40 that meets 502.00 / 505.00 has 1000 / 1100. Not a huge change. Race oil 0W-50 has 1750 / 1850.

[Brillo]

I dont agree with this at all. OA is an integral part of good engine management. You may e right on this general POS engine, but when it costs over 25k usd to re build some engines, OA is a very good thing to do annualy ir semi annualy

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Spot on iceman. For both my planes and almost all the aircraft mechanics I know conduct a UOA at every oil change. There is no better way short of a teardown to monitor the health of the engine or diagnose a potential problem.

[Jeevan]

Running a higher weight isn’t going to slow down your oil consumption.

Fixing your PCV, valve cover, piston rings or turbo probably will though.

It’s better to try to isolate the source of the problem and fix it than it is to try to slow it down or cover it up. There’s no need to run anything other than what Audi recommends. 0W-40 or 5W-40 works just fine.

you know what you were right, i replaced valve cover which was leaking a little, resealed the inner oring of vaccum pump called it a day.

[Theiceman]

reality is VC could be leaking like a sieve internally and burning a ton of oil and you would never ever see a leak. So many people just dont understand this.

[EvolutionArmory]

you know what you were right, i replaced valve cover which was leaking a little, resealed the inner oring of vaccum pump called it a day.

Replaced the whole valve cover or just the gasket?

[Jeevan]

Sorry for the typo lol it’s just a valve cover gasket.

Also, I found rust in spark plug wells. Is this normal due to heat cycles ?


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[Theiceman]

Sorry for the typo lol it’s just a gasket?

Also, I found rust in spark plug wells. Is this normal due to heat cycles ?


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huh ??? he asked you a question , you answered it with another question ? he asked you if you replaced the whole valve cover or just the valve cover gasket! what did you replace exactly. ?

[Jeevan]

huh ??? he asked you a question , you answered it with another question ? he asked you if you replaced the whole valve cover or just the valve cover gasket! what did you replace exactly. ?

Just a gasket. Again sorry about the typo. This damn autocorrection.


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[Theiceman]

okay then, your VC may still very well be the issue unless you checked it thoroughly for internal cracking. cracked internal passages on the VC are far and away the number one reason for high oil usage on this platform.

[Jeevan]

here is the update after 3500 miles of highway and little city traffic driving mostly over 50F temperature.

Mpg went to shit after using 15w50 full synthetic. At least 3 to 4mpg down compared to what it was before.
I had to do a cold start at 40F one day, engine moaned like Blood cancer patient. Immediately got rid of 15w50 and filled it up with 0w40 mobile 1 full synthetic.
no change in oil burning issue. I guess 800ml every 5k mile oil changes is normal now especially after 150k miles.

whats next?

I will try 0W50 Mobil1 full synthetic next summer and see if it makes any changes. NAPA had a sale last Monday on Mobil1 any viscosity for 5$/quart. I figured that this needs to flow in my engine.

[Charles.waite]

Dude, the oil weight won't appreciably affect your oil burning issue. The issue isn't the oil, its the engine itself. My engine burns pretty much bang on 1qt/1400miles and has for the past 40k miles. I've just lived with topping it off every month or two and carry a quart in my trunk. You're not going to solve an oil burning issue by dicking around with oil weight. Its just not going to do anything, because the issue is mechanical. Its either PCV, Valve cover, or piston rings. Not oil weight.

At your rate of consumption, I'd not even worry about it to be honest. Just drive the car and keep a quart in the trunk if you're worried.

[Jeevan]

Dude, the oil weight won't appreciably affect your oil burning issue. The issue isn't the oil, its the engine itself. My engine burns pretty much bang on 1qt/1400miles and has for the past 40k miles. I've just lived with topping it off every month or two and carry a quart in my trunk. You're not going to solve an oil burning issue by dicking around with oil weight. Its just not going to do anything, because the issue is mechanical. Its either PCV, Valve cover, or piston rings. Not oil weight.

At your rate of consumption, I'd not even worry about it to be honest. Just drive the car and keep a quart in the trunk if you're worried.

dude, I am not trying to solve oil burning issue at all. justing trying multiple oil viscosities.

Also, i have replaced PVC, Valve cover gaskets and vaccum pump orings. I dont have any internally leaking VC

[griga]

Why not just use what audi recommends and possibly adjust if you expect long periods of extreme temperatures? I don’t get what changes you’re expecting to see.


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[Charles.waite]

I guess I don't understand why you're just randomly trying different oil weights then. VAG spec only contains 0w30, 5w30, 0w40, and 5w40 oils, and only ones with a specific additive package at that. Thats why they have the VAG 502 approval system.

Now obviously Rotella T6 isn't on that list, nor does it have 502 approval, so do what you will with that info, but when in doubt a 502 spec oil is the way to go. When I get my new engine rebuilt and once its broken in, I'll likely continue running Rotella T6 or switch to Motul X-Clean or X-Cess.

[EvolutionArmory]

Why are we still talking about this oil VS that oil in 2019?

Just run the right weight the MFG asks for and an oil brand that’s approved. Audi already did more testing on weight and brand than anyone will be able to do in their driveway.

If your car burns oil, fix your car. 😀 If that’s too expensive carry a quart in your trunk.

People gotta stop trying to fix a mechanical issue with a different lubricant. It’s a huge waste of time because your engine is still worn out or you still have defective parts.