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varnish sluge #4541600
10/12/17 07:54 PM
10/12/17 07:54 PM
Joined: May 2007
Posts: 378
ogdensburg new york
ernied Offline OP
ernied  Offline OP
Joined: May 2007
Posts: 378
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.


2015 Hyundai sonata.
2015 Hyundai santafe sport
Re: varnish sluge [Re: ernied] #4541605
10/12/17 07:56 PM
10/12/17 07:56 PM
Joined: Sep 2014
Posts: 1,491
Toronto Canada
WobblyElvis Offline
WobblyElvis  Offline
Joined: Sep 2014
Posts: 1,491
Toronto Canada
no

Re: varnish sluge [Re: ernied] #4541607
10/12/17 07:58 PM
10/12/17 07:58 PM
Joined: Aug 2008
Posts: 21,323
ON, Canada eh?
StevieC Offline
StevieC  Offline
Joined: Aug 2008
Posts: 21,323
ON, Canada eh?
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.


Last edited by StevieC; 10/12/17 08:01 PM.

'18 Dodge Grand Caravan GT - AMSOIL SS 5w20
'06 Santa Fe - 535,000km AMSOIL SS 0w30 / ATF
Re: varnish sluge [Re: ernied] #4541641
10/12/17 08:21 PM
10/12/17 08:21 PM
Joined: Sep 2015
Posts: 6,086
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 6,086
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

Last edited by BrocLuno; 10/12/17 08:22 PM.

Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: varnish sluge [Re: ernied] #4541649
10/12/17 08:32 PM
10/12/17 08:32 PM
Joined: Dec 2002
Posts: 497
Ottawa, Ont CANADA
2K2AcuraTL Offline
2K2AcuraTL  Offline
Joined: Dec 2002
Posts: 497
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.

Last edited by 2K2AcuraTL; 10/12/17 08:37 PM. Reason: elaborations

02 Acura TL-P
13 Acura MDX-Elite
Both on PP and PP Ultra & Petro-Can Duradrive synth ATF

Re: varnish sluge [Re: ernied] #4541684
10/12/17 09:05 PM
10/12/17 09:05 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
Clovis, CA
I don't think conventional oil can go 3000 miles without causing varnish.

Re: varnish sluge [Re: ernied] #4541709
10/12/17 09:37 PM
10/12/17 09:37 PM
Joined: Oct 2012
Posts: 4,825
Taiwan
Ducked Offline
Ducked  Offline
Joined: Oct 2012
Posts: 4,825
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.

Last edited by Ducked; 10/12/17 09:39 PM.
Re: varnish sluge [Re: Ducked] #4541726
10/12/17 10:16 PM
10/12/17 10:16 PM
Joined: Jul 2017
Posts: 1,292
Douglas County, Colorado
bigj_16 Offline
bigj_16  Offline
Joined: Jul 2017
Posts: 1,292
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

Re: varnish sluge [Re: bigj_16] #4541736
10/12/17 10:27 PM
10/12/17 10:27 PM
Joined: Oct 2012
Posts: 4,825
Taiwan
Ducked Offline
Ducked  Offline
Joined: Oct 2012
Posts: 4,825
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.

Re: varnish sluge [Re: Merkava_4] #4541741
10/12/17 10:31 PM
10/12/17 10:31 PM
Joined: Feb 2013
Posts: 11,100
Phoenix, AZ
Nick1994 Offline
Nick1994  Offline
Joined: Feb 2013
Posts: 11,100
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.


2015 Hyundai Sonata 2.4L 89k Motorcraft Synthetic Blend 5w30 & OEM
2000 Toyota Camry 2.2L 231k Valvoline 5w30 & Fram Ultra
1996 Jeep Cherokee 4.0L 147k Mobil 1 HM 10w40 & Fram Ultra
Re: varnish sluge [Re: ernied] #4541747
10/12/17 10:42 PM
10/12/17 10:42 PM
Joined: May 2012
Posts: 1,404
Georgia
AVB Offline
AVB  Offline
Joined: May 2012
Posts: 1,404
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.

Re: varnish sluge [Re: Merkava_4] #4541806
10/13/17 03:18 AM
10/13/17 03:18 AM
Joined: Oct 2012
Posts: 4,825
Taiwan
Ducked Offline
Ducked  Offline
Joined: Oct 2012
Posts: 4,825
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.

Re: varnish sluge [Re: ernied] #4541813
10/13/17 04:13 AM
10/13/17 04:13 AM
Joined: Dec 2006
Posts: 4,220
Port Orange, Florida
Panzerman Offline
Panzerman  Offline
Joined: Dec 2006
Posts: 4,220
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.



2006 Dodge Ram 2500 Hemi 4x4
2016 Dodge Challenger Scat Pack
Re: varnish sluge [Re: ernied] #4541827
10/13/17 04:47 AM
10/13/17 04:47 AM
Joined: Oct 2005
Posts: 7,094
Colorado
Kuato Offline
Kuato  Offline
Joined: Oct 2005
Posts: 7,094
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.


Thick vs Thin test: 15k / 43k miles complete
Re: varnish sluge [Re: Kuato] #4541837
10/13/17 05:04 AM
10/13/17 05:04 AM
Joined: Dec 2002
Posts: 41,583
'Stralia
Shannow Online content
Shannow  Online Content
Joined: Dec 2002
Posts: 41,583
'Stralia
Originally Posted By: Kuato
Varnish is harmless discoloration so nothing to worry about.

Sludge will begin to form if any oil


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