Friction Modified Oil or Not?

[Le0n]

Hi Guys,

My Toyota Surf diesel is useing a fair amount of engine oil. About 1 litre per 5000k's. It didn't use much oil before I did a trip to Darwin & return a few months ago, days on end at steady engine speeds.

Before I went I changed the oil to a friction modified oil and my mechanic tells me useing this this could have glazed the cylinder bores resulting in the higher oil useage.

Now I'm trying Penrite HPR Diesel oil 20w-60w grade as I've been told it could help to unglaze the bores.

Any comments?

[murcod]

I have heard something similar Leon- friction modifiers causing oil consumption problems if people suddenly change oil types.

Hope it's nothing permanent....

[mkpatrol]

Your mechanic is right. Friction modified oils will glaze up bores. I bet your mechanic told you your engine is stuffed didn't he? Once the bores are glazed there is no reliable way to deglaze them without stripping the engine.
Mind you, 1lt per 5000k's is not excessive consumption. How does it start in the morning? Does it blow white smoke? 2.4 or 3.0l? How many kays?

[Le0n]

2.4 2LTE Still goes well with good mileage. Starts first thing every morning with a bit of blue grey smoke. Recently fitted new Injectors 7 Glow plugs. Only fitted the Plugs because I was doing the Injectors. Also fitted an oil catch can or diffuser bottle between the rocker cover and inlet manafold.

The motor could do with a rebuild but that will have to wait for a few funds. Has 145000klm's on the clock but who knows with a Jap import?.

[RoldIT]

Worth a try, beats several k$ rebuild if it works ...


http://www.costeffective.com.au/ftcd.htm

http://www.costeffective.com.au/foc.htm


.... and no I'm not a sales rep but just thought it sounded pretty good to me if there was no other choice than a rebuild. Would be interested to find out how it goes if you decide to try it.

Cheers.

[murcod]

I originally heard about the friction modified oils way back in the late '80s. A local Ford dealer was rebuilding lots of near low km engines from them suddenly starting to use oil. Friction modified oil was blamed- supposedly it's fine if you keep using it, but if you change to another oil.....

[Le0n]

Here'a an interesting site

http://www.dieselenginetrader.com/diese ... id=269#748


Cheers Leon.

[murcod]

So, Bonami or OMO- choose your weapon Leon!!!

Might as well just throw in some grit from a bead blaster...

[bazzle]

Use 15w/40 diesel oil. Go to a long hilll and lugg it up a full throttle a few times.

Bazzle

[Le0n]

Years ago it was common to use a product called Redex Upper Cylinder Lubricant to do a quick decoke on petrol engines. Remove the plugs, give a good squirt of Redex, let it soak for a while and then start the motor and squirt large amounts of Redex into the carby.

It worked. Plenty of smoke and shit out the exhaust. I think this would be the rational behind the ATF, may do the same job. Not to sure about the Bonami.

Try it in your Roza Dave,

When I was an engineering apprentice we used kerosine as the last lapping agent for gas valve seats. Maybe a few drops in the fuel would do the job and deglaze the bores. Can't see it doing much for the pump or injectors though.

Might try some ATF in the fuel. would be good for a smoke screen if nothing else.

[bazzle]

Actually a diesel will run on ATF.

The lugging up hill will put extreme pressure on the rings/bore and cause scuffing if they are able to be rescuffed.

Friction modded oil probably didnt put carbon in crosshatch, morelikely polished surface.

Bazzle

[Le0n]

Penzol make a Running In oil.

Just thinking.

Cheers leon

[Mark2]

Land Rover actually recommended the use of Bon Ami to their dealers for glazed Land Rover diesels back in the sixties. They were very specific that it had to be Bon Ami and no other brand.

Apparently it worked well.