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#4541600 - 10/12/17 08:54 PM varnish sluge
ernied Offline


Registered: 05/02/07
Posts: 356
Loc: ogdensburg new york
do conventional oils really cause sludge and varnish if changed at 3000 or 5000 miles.
thinking of going to conventional on my two Hyundai.
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2015 Hyundai sonata.
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#4541605 - 10/12/17 08:56 PM Re: varnish sluge [Re: ernied]
WobblyElvis Offline


Registered: 09/23/14
Posts: 1424
Loc: Toronto Canada
no

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#4541607 - 10/12/17 08:58 PM Re: varnish sluge [Re: ernied]
StevieC Offline


Registered: 08/21/08
Posts: 17192
Loc: Ontario, Canada
If oil is changed regularly within the guidelines of the manufacturer and no mechanical problems exist then no the oil should not sludge. Does conventional oil leave deposits, sure, but this is really a non-issue today because oils are so much better than decades ago.

Three exceptions are engines that require synthetic but conventional is used instead, or engines that are known to have issues with sludging, or engines equipped with Turbo's where the oil is continually beaten up by excessive temperatures like at a track or super heavy aggressive driving all the time leading to extended period of times where the Turbo bearings are hot.



Edited by StevieC (10/12/17 09:01 PM)
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#4541641 - 10/12/17 09:21 PM Re: varnish sluge [Re: ernied]
BrocLuno Offline


Registered: 09/06/15
Posts: 5691
Loc: Kalifornia Kollective
Some of this depends on ambient temperature. Some sludge issues have to do with sheet metal covers or side plates, and oil vapor condensation. It has to do with heat and vapor management.

With modern engine covers (cosmetic) and under engine shields (aero), much sludging has been reduced. But, you are in NY, so winters can still cause vapor condensation. So, look for oils with modest to low NOACK numbers smile


Edited by BrocLuno (10/12/17 09:22 PM)
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#4541649 - 10/12/17 09:32 PM Re: varnish sluge [Re: ernied]
2K2AcuraTL Offline


Registered: 12/22/02
Posts: 459
Loc: Ottawa, Ont CANADA
Case 1 - my TL- owned from new.. its had a synth diet from day 1... no varnish.. lets not mention sludge..please..!!

Case 2 - my MDX - purchased from Acura dealer and ALL OCI [previous owner] done at the dealer, most likely conv oil.. a blend at best.. = its covered in varnish, still trying to get rid of it one year later..

my 2c

J.


Edited by 2K2AcuraTL (10/12/17 09:37 PM)
Edit Reason: elaborations
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Both on PP and PP Ultra & Petro-Can Duradrive synth ATF


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#4541684 - 10/12/17 10:05 PM Re: varnish sluge [Re: ernied]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
I don't think conventional oil can go 3000 miles without causing varnish.

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#4541709 - 10/12/17 10:37 PM Re: varnish sluge [Re: ernied]
Ducked Offline


Registered: 10/25/12
Posts: 4471
Loc: Taiwan
I quite like varnish. I think it may protect from corrosion a bit, and in a car engine it isn't much effort to maintain it.

Bright work on a boat is a whole other story.

"Golden brown, texture like sun...."

Don't like the sound of "sluge" much though, whatever it is.


Edited by Ducked (10/12/17 10:39 PM)

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#4541726 - 10/12/17 11:16 PM Re: varnish sluge [Re: Ducked]
bigj_16 Offline


Registered: 07/03/17
Posts: 1292
Loc: Douglas County, Colorado
Originally Posted By: Ducked
I quite like varnish. I think it may protect from corrosion a bit, and in a car engine it isn't much effort to maintain it.

Bright work on a boat is a whole other story.

"Golden brown, texture like sun...."

Don't like the sound of "sluge" much though, whatever it is.


Actually, "sluge" is quite harmless. The key harmful ingredient,"d", is missing. smile

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#4541736 - 10/12/17 11:27 PM Re: varnish sluge [Re: bigj_16]
Ducked Offline


Registered: 10/25/12
Posts: 4471
Loc: Taiwan
Originally Posted By: bigj_16
Originally Posted By: Ducked
I quite like varnish. I think it may protect from corrosion a bit, and in a car engine it isn't much effort to maintain it.

Bright work on a boat is a whole other story.

"Golden brown, texture like sun...."

Don't like the sound of "sluge" much though, whatever it is.


Actually, "sluge" is quite harmless. The key harmful ingredient,"d", is missing. smile


Word association. Sounds like "slug". They're pretty harmless too, but widely disliked.

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#4541741 - 10/12/17 11:31 PM Re: varnish sluge [Re: Merkava_4]
Nick1994 Online   content


Registered: 02/19/13
Posts: 10446
Loc: Phoenix, AZ
Originally Posted By: Merkava_4
I don't think conventional oil can go 3000 miles without causing varnish.
My Jeep has no varnish, conventional oil it's whole life except for 2 times I used synthetic.
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2015 Hyundai Sonata 2.4L 82k Mobil 1 AFE 0w30 & OEM
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1996 Jeep Cherokee 4.0L 146k Mobil 1 HM 10w40 & Fram Ultra

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#4541747 - 10/12/17 11:42 PM Re: varnish sluge [Re: ernied]
AVB Offline


Registered: 05/20/12
Posts: 1390
Loc: Georgia
I recently came up with the idea that fuel, specifically gasoline causes varnish. I have never seen varnish in a diesel engine. I have seen lots of varnish in carburetors.

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#4541806 - 10/13/17 04:18 AM Re: varnish sluge [Re: Merkava_4]
Ducked Offline


Registered: 10/25/12
Posts: 4471
Loc: Taiwan
Originally Posted By: Merkava_4
I don't think conventional oil can go 3000 miles without causing varnish.


ANOTHER reason not to use synthetic, which I hadn't really thought of before. Thanks.

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#4541813 - 10/13/17 05:13 AM Re: varnish sluge [Re: ernied]
Panzerman Offline


Registered: 12/16/06
Posts: 4217
Loc: Port Orange, Florida
Conventional oil meets the same specifications as Synthetic and has SN rating.
Now you can get into the Dexos but for the average car/ truck Conventional oil changed regularly at 3000-5000 miles will lead to a long life.
It's changing it regularly that's important and 3000-5000 is a safe Interval.
The best Conventional oil in my opinion against sludge and varnish is Castrol GTX. I've seen engines improve looking down the oil fill hole from that oil. Always turns black quick too.
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2006 Dodge Ram 2500 Hemi 4x4
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#4541827 - 10/13/17 05:47 AM Re: varnish sluge [Re: ernied]
Kuato Offline


Registered: 10/23/05
Posts: 7094
Loc: Colorado
Originally Posted By: ernied
do conventional oils really cause sludge and varnish if changed at 3000 or 5000 miles.
thinking of going to conventional on my two Hyundai.


Varnish is harmless discoloration so nothing to worry about.

Sludge will begin to form if any oil - dino or synthetic - is used for too long of an interval. Using dino for an appropriate distance, you will not get sludge (unless you have one of the sludge prone engines). Do yourself a favor when and if you switch, and get a UOA or two to set your proper interval.
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Thick vs Thin test: 15k / 43k miles complete

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#4541837 - 10/13/17 06:04 AM Re: varnish sluge [Re: Kuato]
Shannow Offline


Registered: 12/12/02
Posts: 40477
Loc: 'Stralia
Originally Posted By: Kuato
Varnish is harmless discoloration so nothing to worry about.

Sludge will begin to form if any oil


One begets the other...

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