Hello Gentlemen! What is the most ideal viscous fan clutch oil viscocity for all weather especially on hot summer days to keep the cooling system at it's most efficient performance? Thanks!

__________________
'85 300D Turbo - CA Version

there's been some experimentation on this very topic. Don't recall where I saw it. Somebody found an oil from Toyota, IIRC, that was appropriate for this application. I'd suggest a search on "viscous fan clutch repair" or perhaps somebody will be able to direct you to the earlier thread.

__________________
1998 W210 diesel (wiped out by a texter)
Baum spring compressor "for rent"

10,000 cst

__________________
The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)

hmmm I need to fix mine as well

Thanks jbaj007!

__________________
'85 300D Turbo - CA Version

used that stuff last year on mine and it worked great

How thick is 10,000 cst?

Similar to 10w? 30w? gear oil??

I have access to silicon oil in various viscosities, but no way to measure the viscosity.

__________________
Palangi

2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg



TRUMP .......... WHITEHOUSE
HILLARY .........JAILHOUSE
BERNIE .......... NUTHOUSE
0BAMA .......... OUTHOUSE

More like molasas. It's pretty viscous stuff.

Can anyone share the Toyota part # for the 10,000 cst viscous fan clutch oil?
I just went to a local Toyota dealership and they seem to have no clue whatsoever of what I was asking about.

Are the another brand or source of this fan clutch oil aside from Toyota? Is there any generic name or brand of it that is usable for a W123/OM617 fan clutch?

Thanks!

__________________
'85 300D Turbo - CA Version

I originally tried the Toyota oil. I think it only comes in 4000, 6000 cst and/or 8000 cst? I'm sure it would all work fine, but I decided to drill my fan clutch to fill and used some 10,000 cst that someone on the forum was kind enough to offer, after I'd used up my Toyota oil. I wish I could remember who it was, because it was really nice of him. Apparently he had got his in bulk and shared it with some of us. This was a while ago.

The 10,000 is just what was given me, and it worked fine. It was from the nameless benefactor and he had tried it first with good results, so I did.

Edit: here's some...http://www.amazon.com/Silicone-Diff-Oil-10-000/dp/B0006O7MG0/ref=sr_1_34/002-6743598-4432851?ie=UTF8&s=toys-and-games&qid=1180660658&sr=8-34

Edit edit: way better buy....http://cgi.ebay.com/KYOSIL10000-Kyosho-Silicone-Oil-10000-40CC_W0QQitemZ110101513822QQcmdZViewItem

__________________
The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)

Found the part #'s in this article AND Toyota DOES make a 10,000 cst oil!!

http://zhome.com/ZCMnL/tech/FanClutch/FanClutch.htm
http://members.rennlist.com/blueshark/page12.html


jcyuhn, You're right. here's some more.

Viscosity Comparison Chart for Silicones
Below is a reference for the viscosities of silicones to common fluids. The comparisons are not exact and should only be used as a general guide.

Viscosity cSt. Reference Object
1 to 5cSt. water
10cSt. kerosene
20cSt. transformer oil
50cSt. Sae-5 oil
100cSt. Sae-10 motor oil
350cSt. Sae-30 motor oil
500cSt. Sae-30 motor oil
1,000cSt light syrup
2,500cSt. pancake syrup
10,000cSt. honey
25,000cSt. chocolate syrup
50,000cSt. ketchup
60,000cSt thick molasses
100,000cSt. hot tar
250,000cSt. peanut butter
1,000,000cSt. paste/caulk

__________________
The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)

Thanks for all the knowledge and useful infos jbaj007! I really appreciate it! These helps a lot.

__________________
'85 300D Turbo - CA Version