680 oil report
 

Hi Folks,


I ordered some Shell 680wt. oil for my tranny and put it in last week. I drained out the test oil (what was left of the vendor stuff and a can of STP) which I used just to get around the block to test the clutch. And added the new oil. Well went on my clubs mystery tour this weekend and she shifted SO smoothly with that oil in her.

I only had one small issue and that is when she slid out of third gear going down a slight grade. No noise, no jolt, no nothing-just slid right out of gear. So after a split second of panic I revved the engine and put her back into gear and kept right on going. And the best part-she doesn't drip like with the vendor supplied oils!

Mike

Re: 680 oil report
 

Good to hear.

I often wonder what vendors use what oil.

Re: 680 oil report
 

Is the 680wt oil as thick as the ones that the vendors sell?

Re: 680 oil report
 

I thought it was little thicker. Then again there may have been a little STP left over.

Mike

Re: 680 oil report
 

If you continue to have the dropout in third you might pull the tower and go thru it. Could be wear at the forks, the detents, the ball on the end of the shifter, or the fork pins.

Re: 680 oil report
 

I will keep an eye on it next year as she is pretty much done for the year, maybe one more tour. Then again, when I am 84 years old I assume I will some tuning up at some point.

Mike

Re: 680 oil report
 

Where can you purchase Shell 680 wt buy the qt. I would like to try it my transmission . I get a little grind in between 2 & 3. At times do you think it will help ?

Re: 680 oil report
 

I had tried to get 600 wt around here and the best a supplier could do was a 55 gallon drum of the stuff. So I went with the vendor lube.

Re: 680 oil report
 

Chevron also sells 680. I buy it in a 5 gallon bucket from my local distributor.

Re: 680 oil report
 

I have some 600W oil left over that was purchased from a Model A supply house about 15 years ago, and it has the same consistency and SMELL as the oil in transmissions removed from cars over 50 years ago.

I recently purchased several quarts of 600W from different Model suppliers and none of them have the same aroma as the 600W used for decades. In fact, one the the quarts of recently purchased 600W stunk so bad that I am reluctant to use it.

Does anybody know where to obtain a 600W oil that is the exact same formulation as what was available for decades so we don't have to use stinky oil or someone's concoction of STP and 140W oil mixed together?

Re: 680 oil report
 

The good old smelly sticky 600w of years back is not available. Modern 600w is different-thinner than the old stuff. That is why people like me use the mobilgear 680 or the same type of 680 from other suppliers. Closer to the old stuff but still different.

Re: 680 oil report
 

"Maybe" I've been watching too many Old Western Movies, & "wonder" what's in the REMEDYS sold from the "Doctors" brightly painted wagons. I "wonder" what's in some of the "miracle" 600W gear oils that are marketed widely??? Just tell us WHAT they contain. There's NO OIL that will change 80 something year old technology.
I'm served well by plain old 180W Gear Oil, available widely. The Dog agrees with this, also.
Bill W.

Re: 680 oil report
 

Please note that the viscosity on this oil is using a system called ISO, so this oil is an ISO Viscosity Grade 680 gear oil. As mentioned by others, it is made and sold by many different lube companies. For example, Mobil sells it as Mobilgear 600 XP 680. Lubriplate also sells it. They say theirs is an ISO grade 680 and an SAE grade 250 (so that gives you a feel for how thick it is, a bit more than the 180W oil).

YMMV.

Re: 680 oil report
 

http://www.kellerheartt.com/mobile/P...Code=550026681

This company mail orders 5 gallon pails

Re: 680 oil report
 

It does get a little confusing, 680-250 being the "same"!

Re: 680 oil report
 

Interesting chart here comparing ISO to SAE gear oils and motor oils.

http://www.doolittleoil.com/faq/visc...ae-iso-or-agma

Re: 680 oil report
 

680 is great in warm weather. If it gets too cold you can't shift at all! ISO is measured in cP, centipoise, an SI metric unit of viscosity. SAE labels for oil has something to do with saybolt universal seconds an American unit of viscosity. The seconds refers to how long it takes in seconds to empty a standard volume of oil at a specified temperature thru a standard size hole in the bottom of the cup. SAE 50w is not necessarily 50 SUS! That is one reason they went to cP. Ah, the good old days when I was taking fluid mechanics in school or talking to lab technicians in the refinery testing lab!

Re: 680 oil report
 

Excellent chart Bruce, thanks for posting.

Re: 680 oil report
 

This is where I got mine from. The only shifting issue I had (outside of the slipping out of gear) is it ground early in the morning when it was chilly out. So it definitely has to warm up.

Mike

Re: 680 oil report
 

i find it amusing that none of the suppliers who participate on the forum never comment on what they sell for 600W......it's their secret ace in a hole:):o