Best Oil after Overheat

[Promotec]

Hi Guys 2002 VX V6 auto
Blew a radiator had bad overheat, cracked head.
$1500 later cars back on the road with exchange heads etc etc
work was Professionally done by engine reconditioner and mechanic next to them, There was alot of sludge in the motor when it was pulled down
running fine, done about 1000 klms now, motor a bit noisy with
what I would say is lifters when cold start, quietens a bit once warm but still a bit of noise, there was a bit of lifter noise prior to over heat.
Question: which oil would be best to remove sludge, offer best lubrication and
quieten lifter noise, currently running 15w 40, this is what the mechanic advised and put in the motor, il be giving frequent oil changes well under the recomended klms for 2 or 3 oil changes to assist in clearing sludge.

Any thoughts or advice would be greatly appreciated.

Im still very paranoid everytime I here a noise or feel a vibration

Regards Chris

[lumina01]

use a good quality oil flush b4 you put your oil in if you want to be on the safe side

[vxcalais_01]

The paranoia comes standard im the same hehe. Anyway, run MObil Delvac MX or Repco Diesel 15W40, both are the same. Use for around 5000k's. Dont change out too frequently otherwise oil cant do its job. Rather change filter at every 2500k's.

Otherwise go to this site and order some Auto-RX. BEst engine cleaner on the market, anywhere, ever.....safe to use. I speak to heaps of people who have used it, even a oil tribologist here in Melbourne who lectures on oil at UNiversities (hes like around 60+) uses it and has demos set up.

Auto-Rx Engine Cleaner

Most other cleaners use solvents which can damage the seals and take off too much too quick. See how much it costs from teh U.S, sometimes Frank has it on special. Otherwise there are Oz distributers but not many. I got some when Oz dollar was still in the 90 cents range.

[Promotec]

Hi there
Yes I had come across Auto-rx the other day when searching on cleaning the sludge out of the engine internals, there are many recomendations for it Ill try and track some down.
The mechanic that worked on the car recomended putting a litre of diesel into the oil a week prior to an oil and filter change but have read many disagreeing about this so will not try that one, the mechanic even though his work seemed alright isnt, someone id put much trust in. The Repco Diesel 15W40 sounds like a good recomendation as apparently the diesel oils have more detergents etc for cleaning the engine, thanks for your input guys much appreciated

Regards Chris

[pablo]

Sludge can be likened to mud, and is found mostly in the sump and little hollows of high mileage engines. It's made up of tiny bits of carbon from the combustion of the fuel and burning of the lubrication oil.
Varnish is found generally throughout the engine as a golden brown film, most noticable on the non working machined surfaces. Caused, in part, by the tars coming out of the hot lube oil and solidifying back onto the metal surfaces and also going to far between oil changes.

To remove either one from the internals of an engine is best done by completely stripping the motor, cleaning it up, then re assembling it.
Putting 'snake oil' or any other solvent to dislodge these deposits in an engine, will only mean that these dormant, inert deposits will be dislodged and circulated through the bearings and up around the rings and cylinder bores, hoping the filter will catch the bigger bits.

[Promotec]

Hi Pablo

Yes I agree with everything you have said, in an ideal world, a full strip down would be the best answer and while stripped down, new bearings, rings, valves, seals , gaskets
etc etc, In an ideal world I would just buy a new 09 model, unfortunately we dont live in an ideal world, we only have one car and live semi-rural, no car, no transport to work, no income, no house to live in or food to feed the family :-( Financial colapse
Dont get me wrong, Im not being sarcastic just realistic, as it was, a $1500 mecanical bill
strained things to breaking point, thanks to Mr Rudds second stimulus package we have been able to get our heads back up above the water level.

Thankyou for your input Pablo much appreciated.

[vxcalais_01]

Sludge can be likened to mud, and is found mostly in the sump and little hollows of high mileage engines. It's made up of tiny bits of carbon from the combustion of the fuel and burning of the lubrication oil.
Varnish is found generally throughout the engine as a golden brown film, most noticable on the non working machined surfaces. Caused, in part, by the tars coming out of the hot lube oil and solidifying back onto the metal surfaces and also going to far between oil changes.

To remove either one from the internals of an engine is best done by completely stripping the motor, cleaning it up, then re assembling it.
Putting 'snake oil' or any other solvent to dislodge these deposits in an engine, will only mean that these dormant, inert deposits will be dislodged and circulated through the bearings and up around the rings and cylinder bores, hoping the filter will catch the bigger bits.

Pablo, Auto-RX is not snake oil, trust me....... there has never been so much user support, specialist backup for a product like this. If you see the way it works, it is definately not snake oil. It was invented initially for cleaning out lube lines in printing machines etc. It is purely a metal cleaner, not a wonder additive, nothing more, nothing less.

Sludge is a concern, varnish is not. The sludge blocks galleries and affects how an engine conducts heat and so on. Varnish is more superficial, and does no harm.

Promotec, good decision on avoiding the diesel fuel. Does not belong in an engine. Run the Repco Diesel, get the 10litre bottle, do some research and you will realise how good Repco Diesel/Mobil Delvac is. Its a diamond in the rough, many of us including my self are victims of marketing, we wanna see racing cars, flash names on bottles of oil.

[Johnsy]

Mobil 1.... 5W 30....... or 0W 40 if running a V8..

that's what Holden say anyway....


Any decent synth oil should do fine.......

[pablo]

What I am trying to get at is, sludge, varnish, whatever has settled out of the oil and is sitting inertly in the engine. I personally dont think it is a good practice to stirr it up and putting it back into the circulating lube oil to be passed through the bearing shells or up the bore. I don't think the filter is going to catch it, because it didn't catch it before, hence the build up..

and as far as a bit of lifter noise, don't worry about it, mine are a little noisy at start up also, I don't give them another thought.

[Mick1988]

You can buy a small bottle of additive that you can put in with your oil that works specifically on getting rid of lifter noises and knocks.

[Promotec]

Hi Mick1988

Yes I was in supercheap auto today and saw some of the stuff your talking about
this works through cleaning the releif valves and oil galleries related to the hydrolic lifters
not sure whether beneficial or not, this probably falls fully into the area of snake oild but may be worth a shot, if it quietens the lifters a bit it also stops the paranoia a bit *grin*
however putting a set of new lifters on the todo list is probably a bit more long term sollution ( as long as they get done and dont just remain on the list )

Regards Chris