Reply With QuoteHoly mackeral, i saw a photo of a TD42 Patrol that hadn't had an oil change since it was new, looked just like that...
Master
Oil Turned to Sludge/Jelly
Wondering why the oil light was on in my 200Tdi Defender when the dipstick level was fine. Took the rocker cover off and am looking at jelly/sludge instead of oil. Oil was changed 4,000kms ago and no sign of coolant in the oil - the jelly/sludge/oil is pitch black!
I have been using Penrite HPR Diesel 5 (5W-40) for the last few years but this oil change I thought I'd try Nulon High Protection Diesel Formula (15W-40). I also used a Nulon engine oil flush - something I've never used before. Haven't changed coolant types or brands - have a slight coolant leek from the radiator that needs replacing (money issue), but as I said the oil has no sign of coolant or water in it.
So far I've done three oil changes with Caltex Delo 400 a hundred km's apart with an oil flush through each time, cleaned the rocker/valves each time and on the last oil flush/change I dropped the sump to see how it was going…rather bad still! Had to pull the oil pump apart and clean it out.
Asked the guys at British Off Road about it and they'd not seen anything like it before. Asked a friend that was a mobile truck mechanic for many years and he said he'd only seen something like it once with a truck that had missed a few oil changes. But this has happened 4,000kms into a 10,000km oil change - there's still meant to be 6,000kms till an oil change is due!!
On my previous oil change with Penrite HPR Diesel 5 I also did a valve clearance adjustment so had the rocker cover off - everything was clean with no signs of sludge buildup at all. All I can come down to is it must be something in the oil that has caused this…but I'm at a loss!
Will be contacting Nulon to try and get to the bottom of it. So far it's been a very expensive exercise - 18L of Caltex Delo 400, 3 lots of Nulon oil flush, 2 oil filters, gaskets, not to mention workshop time!
What do you think it could be?
Here are some photos documenting it:
This is what I got under the rocker cover when I opened it up!
Hard to imagine this oil has only done 4,000 of easy driving!
Rocker/Valves after first oil flush/change
Condition of sump/oil pump after 2 oil flushes/changes!
This is what it should look like!
ChatterBox
Holy mackeral, i saw a photo of a TD42 Patrol that hadn't had an oil change since it was new, looked just like that...
Master
I hope this may help but have you thought of maybe petrol or diesel may have mixed with the oil.
Actually, they extract the jelly from petroleum.
Petroleum jelly is a mixture of hydrocarbon chains with lengths of 25 or more carbons. A hydrocarbon is just what it sounds like, a chain of carbons where every carbon has hydrogens bound to it.
The length of the chains determines whether the hydrocarbon will be a liquid, like gasoline (with lengths from 6 to 10 carbons) or mineral oil, or a solid, like paraffin wax (with 20 to 40 carbons in the chain). Petroleum jelly is in between, with around 25 carbons (there are a number of different molecules of different lengths in the mixture).
A crude black form of petroleum jelly was originally discovered by workers on oil rigs, as a gunk that fouled up the machinery.
Last edited by bussy1963; 10th July 2012 at 10:03 AM. Reason: spelling
Moderator
Only reason i know of that causes oil to turn to sludge is when it reaches/exceeds its engineering specifications, i.e can't handle it, or sitting for aaaaaages.
Odd....maybe you got a contaminated batch or something?
Cheers
Muppet
Last edited by Disco Muppet; 10th July 2012 at 10:12 AM. Reason: Deleted irrelevant items
ChatterBox
SubscriberI had dealings with a japanese truck in about 1982 where this had happened due to diesel leaking from the injector pump into the sump, the diesel mixing with the oil causes it to congeal. There was a thread on here a few months back with a similar issue, think it was a td5, don't recall what the outcome was. A search should find it.
Fossicker
matei would be washing the inside down with kero to get the sludge out before i ran it to flush the last bit out.
that way you only need to mix a little of it with the next oil change instead of a lot.
cat do oil sampling for about $35 it would tell you what is in the oil.
you of course would need a cap full of clean oil the same as you used
Swaggie
My Tdi 300 did this about 10,000 ks ago no idea why (castrol magnatec in my case ) but ive yet to find some where to get the sample i saved for testing, I removed the sump cleaned out the oil pick up tube removed and renewed the the big end bearings sprayed degreaser insde the under side of the motor then rinsed replaced the filter . I used alcheapo oil warmed the motor up put some engine flush in ran for 20 minutes and droped the oil and filter, I repeated the process 1000 ks latter , I now use castrol gtx diesel with no ill effects from the past exrerience
hope this helps
Swaggie
Oh and when mine had done this it also had done about 4000 ks since last change , I always do oil and filter at 5000 k intervals always
ChatterBox
SubscriberSomething to do with changing/mixing mineral based oil(s) with synthetic/semi-synthetic based oils ?
Deano
Swaggie
Im told its more to do with extreme operating temps , The Weather is one factor as well as engine temps , Been told if your played with the pump and not watched your egt,s could also be a factor , In my instance id used magnatec for 3 oil changes before handOriginally Posted by DeanoH
Something to do with changing/mixing mineral based oil(s) with synthetic/semi-synthetic based oils ?
DeanoBut the weekend that my oil solidified i had moved house and done some very heavy towing so the motor was worked hard , Maybe the Tdi is a agricultral engine which does not like the synthetic oils hence why ive gone back to mineral oils
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