Molybidenum disulfide additive

[icelandic]

I own a 850 NA Volvo with 160K miles on it. It is currently undergoing Auto RX cleaning. The engine has moderate blow-by. After reading the Moly Basics, it occured to me that by adding such additive to the engine oil, it may help reduce the blow-by. The only MOS2 additive available in my country is Molykote.

Is this a good idea? Will it work in my engine both as a corrective to moderate blow-by and as added protection? I use dyno oil in my car.

Thanks for any input.

 

[unDummy]

All engines have blowby.

After the ARX, monitor oil consumption. You might just need a thicker oil weight.

 

[wileyE]

Found with some engines just a viscosity change can reduce blowby and oil usuage. Not a rule but found that thinner oil is what helped in some cases, though thicker seems most logical.

 

[Pablo]

Don't use that stuff. Finish the cleaning and then use a good 15W-40.

 

[MolaKule]

Moly will not help blowby. In it's soluble form, it is used mainly as a friction reducer.

 

[glennc]

If I'm not mistaken the molybdenum disulfide is the form of moly that you do NOT want to put in an engine. Trannies and diffs, okay, but the filter will clog with it in the engine. The oil soluble form of moly is chemically different.

Somebody correct me if I'm mistaken on this.

- Glenn

 

[denaliguide2]

Am not sure about the chemical form of moly, but the oil chemists have found a way to keep it suspended in oil.. Royal Purple has it in it, as I do beleive Schaeffers might also. For moly from the source, you might try www.guarddogmoly.com, out of Houston. I do not know whether it would help blowby. I would be liking to find an oil with a bit better viscosity or shear resistance..........

my 2 cents from Alaska, at - 35 F.

Nick

 

[MolaKule]

http://theoildrop.server101.com/cgi/ultimatebb.cgi?ubb=get_topic;f=4;t=000353

If you don't know what form the moly is in, or how much you really need, don't use it.

 

[nicholas]

Ok, now I know engine additives are not really welcome here, but....
I have been using a MOS2 for about 50,000 kms,
Its sold in Canada as moly "e" slip.

my 00 civic used about .5, .8 litres of oil every 6,000kms.,

I use 400mls of moly every 12,000kms,
and on the first oil change I did after adding it , my car did not use/ burn any oil.,
I measured this just to make sure, " yes i know about the extra 400mls", and this was taken into account when the change was done.

Since using the black stuff - MOS2-, my car does not seem to burn anything.
I also have pictures of my valve train at 130,00 kms, and its spotless.

I have herd of horror stories about it , my engine was very clean before using it , and continues to be so .

 

[MolaKule]

No one ever said moly was a cleaner or that it caused crud. Alone, It will not reduce or cure blowby. A 15W40 HDD motor oil will reduce blowby much better than moly and a 5W30 or 10W30 PCMO.

Chemically, (as per
http://theoildrop.server101.com/cgi/ultimatebb.cgi?ubb=get_topic;f=4;t=000353 )

moly disulfide powder is a good anti-wear additive in gear lubes and MolyDithiocarbamate (soluble moly) is a good friction reducer in PCMO, hydraulic, and other AW oils.

Molydisulfide powder is too unstable and corrosive in motor oils unless a metal deactivator is used.

 

[rauljimenez]

Here is what Im using in my Isuzu Rodeo 1993 3.2L , CHEVRON 15w40 HDEO with 6 onz of VSOT and AUTO-RX to clean.

 

[Steelhead]

How much "blowby"? psi at 2000 rpm?

only way to solve excessive "blowby" is to bore and diamond crosshatch lap cylinders, new pistons and rings.

use a top quality PAO/Ester synthetic ?w40 oil after the ARX and don't worry, be happy.

change the pvc valve every 10k miles and put in a pvc line oil catch to keep your intake system clean

solid moly forms such as disulfide powder end up on the bottom of the oil pan with the sludge and dirt after settling out of suspension, it works in grease because it cannot settle out

[ January 19, 2006, 11:35 PM: Message edited by: Steelhead ]