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Fuels & Lubricants Discussion all about Fuels & Lubricants. synthetic oil, conventional oil, brands, change intervals, diesel grades, gelling and such debated items like that. Non TDI related postings will be moved or removed. This forum is NOT for the discussion of biodiesel and other alternative fuels.

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Old April 25th, 2019, 03:39   #1
CatherineL
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Default 5w40 vs 15w40

My TDI is a 2006 VW New Beetle. I inherited it 2 1/2 yrs ago from my daughter. To my knowledge, only 5w30 and sometimes 5w40 have been used in it. Mileage is 139k. Yesterday, the foreign auto shop used 15w40 for routine oil change. I assumed they would be using 5w40. I didn't notice the change until I looked at the invoice now a day later. I live in East Texas, thus a hot weather climate w/o snow. I had hoped to stall off next oil change until closer to 10k miles (which will take me the rest of the year to reach). Question is: Need I be concerned about running on 15w40? Thank you in advance.
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Old April 25th, 2019, 03:49   #2
oilhammer
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You need to find another shop, as that one evidently cannot read at a 6th grade level.

The oil requirement in your car is a 505.01 spec 5w40 oil. Changed at 10k mile intervals.

It is in the manual, and there is usually a warning sticker under the hood.
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Old April 25th, 2019, 07:49   #3
andreigbs
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While a diesel-rated 15w40 oil may not harm your engine immediately, I'm with Oilhammer: replace ASAP with the correct spec oil.

That 15w40 isn't synthetic, it's quite thick and doesn't contain the correct additives required for the Pumpe-Duse engine. I'd also be concerned with coking the turbo due to non-synth oil. Others may swear by it for their big rigs or Cummins, but your TDI is neither of those.

In the future, I wouldn't use that shop (or any other) unless they tell you they stock the correct oil for your car as OH mentioned above. Better yet, I'd do my own oil changes just to make sure it's done right.
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Old April 26th, 2019, 22:08   #4
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^^^all of the above. Find a tech that knows what he's doing.
Where are you in East Texas? Someone here might be able to help you locate a competent tech.
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Old April 27th, 2019, 04:41   #5
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Quote:
Originally Posted by andreigbs View Post
That 15w40 isn't synthetic, it's quite thick and doesn't contain the correct additives required for the Pumpe-Duse engine.
Iím not disagreeing with you since it is not stated what type 15w40 oil was used but there are plenty of full synthetic 15w40 oils available. Also 40 weight is 40 wt. 15 is only thicker when cold. If 5w40 is fine for -10f cold starts then 15 would be fine for +20f.
The only question should be the oil specs for the cat and other critical wear points.
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Old April 27th, 2019, 13:09   #6
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Quote:
Originally Posted by FarmerboyTdi View Post
Iím not disagreeing with you since it is not stated what type 15w40 oil was used but there are plenty of full synthetic 15w40 oils available. Also 40 weight is 40 wt. 15 is only thicker when cold. If 5w40 is fine for -10f cold starts then 15 would be fine for +20f.
The only question should be the oil specs for the cat and other critical wear points.
PDs eat cams even with the right oil

trouble with 15w is real cold starts, it'll pump up the hydraulic lifters and stall to not start again until the lifters leak down when the engine warms up in spring
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Old April 27th, 2019, 13:36   #7
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It's also entirely possible that somebody goofed on the invoice and 5w40 was used. If it is 15w40, it's probably kinder to the engine than the 5w30 used in the past- at least in the Texas environment. HDEO' s have come a long way in the last 20 years.
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Old April 27th, 2019, 17:32   #8
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Quote:
Originally Posted by FarmerboyTdi View Post
Iím not disagreeing with you since it is not stated what type 15w40 oil was used but there are plenty of full synthetic 15w40 oils available. Also 40 weight is 40 wt. 15 is only thicker when cold. If 5w40 is fine for -10f cold starts then 15 would be fine for +20f.
The only question should be the oil specs for the cat and other critical wear points.
The cat is not lubricated by engine oil. If you don't feel like using the correct oil why are you asking for validation here? Sure you can rationalize using the wrong oil by waiting for someone to come along to wrongly justify your decision.

At least 4 people told you to use the correct oil, which is VW spec 505.01. 5W-40.
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Old April 28th, 2019, 05:20   #9
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Quote:
Originally Posted by [486] View Post
PDs eat cams even with the right oil
trouble with 15w is real cold starts, it'll pump up the hydraulic lifters and stall to not start again until the lifters leak down when the engine warms up in spring
And Iím not disagreeing with the cold starts as I said. You will notice (if you take the time to look) that he is in east Texas. It rarely gets below freezing even in the winter much less in summer. Up north where it regularly gets WAY below freezing in winter do you park it for the winter? As I said, 15w40 is thinner at 32f than 5w40 at -32f.
Also Rattler, I know the cat is not lubed by oil🙄, but the wrong spec oil can have additives that will plug the cat. If you tell me thatís not true Iíll stop using Euro spec oil and go with something with better anti-wear additives. If I ever get a catless down pipe I will switch to something better.
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Old April 28th, 2019, 06:17   #10
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Quote:
Originally Posted by FarmerboyTdi View Post
I’m not disagreeing with you since it is not stated what type 15w40 oil was used but there are plenty of full synthetic 15w40 oils available. Also 40 weight is 40 wt. 15 is only thicker when cold. If 5w40 is fine for -10f cold starts then 15 would be fine for +20f.
The only question should be the oil specs for the cat and other critical wear points.
Look around and try to find a full synthetic 15w-40 andof the ones that are out there I seriously doubt that is what was used.
One of the most "critical wear points" (other than the PD cam) is the turbo. Conventional oil(s) won't stand the heat on these tiny ultra high rpm devices.
But, if you intend to justify the 15w-40, leave it in there/continue using it. Many have-I suppose.
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Old April 29th, 2019, 11:19   #11
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A friend of mine owns a VW repair shop. He has had many PD engines come in with bad cams, due to people not using the correct Euro spec oil. Mobile One Diesel truck does not even meet the 505.x spec.

So, use the proper oil, if you want that engine to last.
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Old April 29th, 2019, 11:37   #12
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Suggested by this forums PD cam guru

Quote:
Originally Posted by Franko6 View Post
As for Schaeffer's oil, I don't think it's far from reality, that our PD cam kits, with the proper oil, which we think is Schaeffer's 9000 5-40, that Schaeffer's Oil company has noted an increase in usage since we have been promoting it. Our cam success is not because of a single improvement.

Maybe that's not the way some see it. When we are talking oil, everyone is entitled to their own opinion.
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Old April 29th, 2019, 11:48   #13
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Quote:
Originally Posted by rrgrassi View Post
A friend of mine owns a VW repair shop. He has had many PD engines come in with bad cams, due to people not using the correct Euro spec oil. Mobile One Diesel truck does not even meet the 505.x spec.

So, use the proper oil, if you want that engine to last.

PD tdi's are going to wear out cams no matter what oil is used. It's just a piss poor design.
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Old May 1st, 2019, 19:13   #14
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Quote:
Originally Posted by MichaelB View Post
Suggested by this forums PD cam guru


Do you have the link to this thread? Iím using Schaefferís 5W-40 in our 2014 JSW. Iíd like to read the rest of the thread. Iíve been a big believer of Schaefferís for the last 15 years.
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Old May 1st, 2019, 19:58   #15
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Quote:
Originally Posted by jtharvey View Post
Do you have the link to this thread? I’m using Schaeffer’s 5W-40 in our 2014 JSW. I’d like to read the rest of the thread. I’ve been a big believer of Schaeffer’s for the last 15 years.
Big number one here. If you are using Schaeffer's 5W-40 in your 2014 CR you are not using the correct spec oil for your engine. If by chance you have deleted your emission control systems I guess it doesn't matter but you're on your own. Franko6 is the PD cam guru, go to guy and recommends Schaeffers 9000 5W-40 because of the design errors made by VW in developing their PD engine with flat tappet rockers. Your 2014 CR has roller rockers and the 5W-40 spec is unnecessary and will probably lead to an early demise of your dpf.

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