Gary Allan just shared some insight with me on the flow resistance of an oil filter. It's apparently too low to be much of an issue- otherwise the bypass valve would always be opening. I suppose the valve would never open if you were dealing with a superfluid, which has zero viscosity.
Thinner oil = Increased wear?
- Thread starter djb383
- Start date
- Status
When the Mil-46167b specification was introduced it specified that that an oil with a minimum of 5 centistrokes at 100 degrees centigrade be used and no upper limit was specified. This conforms to a 0w20 grade oil yet many mechanics interpreted the minimum viscosity specification as a limitation that no widely cross graded 0w30 grade oils could be used.
When the mil-46167d oea-30 specification was introduced it specified that a minimum of 9 centistrokes at 100 degrees centigrade could be used. So it proved that not only a 0w30 oil could be used but that the SAE 30 grade was the minimum viscosity that could be used. But we still have these old school mechanics that say a 0w40 cannot be used just like we had the old school mechanics say that a 0w30 cannot be used. These mechanics say this because they are against widely cross graded oils.
When the mil-46167d oea-30 specification was introduced it specified that a minimum of 9 centistrokes at 100 degrees centigrade could be used. So it proved that not only a 0w30 oil could be used but that the SAE 30 grade was the minimum viscosity that could be used. But we still have these old school mechanics that say a 0w40 cannot be used just like we had the old school mechanics say that a 0w30 cannot be used. These mechanics say this because they are against widely cross graded oils.
Now how can we a have a widely cross graded synthetic 5w50 grade oil that meets mil-prf-2104h specifications when these specifications cleary call for an oil that has a viscosity of less than 16.3 centistrokes at 100 degrees F ?
We simply make an oil with more narrow tolerances than required. For example if we manufacture an oil that the oil is to be 16.25 centistrokes at 100 degrees centigrade we can round down the number to 16.2 centistrokes so that the oil meets the SAE 40 grade or we can round up the number to 16.3 centistrokes so that the oil meets the SAE 50 grade. So now we have an oil with such exact tolerances that it is both an SAE 40 and a SAE 50 grade oil so that it meets the mil-prf-2104h grade as well as the mil-46167d grade.
We simply make an oil with more narrow tolerances than required. For example if we manufacture an oil that the oil is to be 16.25 centistrokes at 100 degrees centigrade we can round down the number to 16.2 centistrokes so that the oil meets the SAE 40 grade or we can round up the number to 16.3 centistrokes so that the oil meets the SAE 50 grade. So now we have an oil with such exact tolerances that it is both an SAE 40 and a SAE 50 grade oil so that it meets the mil-prf-2104h grade as well as the mil-46167d grade.
Ok, ok, so Synlube 50wt is the greatest oil ever in the "higher performace" Detroit 2 stroke that will run on 5w20 in cold weather and in piston powered aircraft which these outdated mil-spec's have something to do with that. (insert pic of beating a dead horse here) Is that the thesis that you are attempting to prove? Thanks.
I'd say TROLL but this is different, a lot "different". I was lost after bots 1st post!
He lost my attention by continuosly mentioning Synlube.
Hey Bot - Until you can read and understand the first page of a Mil Spec, leave them out of your posts. Otherwise, you just wearing your a** for a hat.
- Joined
- Sep 28, 2002
- Messages
- 39,798
(visions of Carnack the Magnificent w/envelope on forehead)
I see whirlwind ..spinning around and around ..and...(straining) ..a padlock ...
(opens evelope)
Son of a gun!
I see whirlwind ..spinning around and around ..and...(straining) ..a padlock ...
(opens evelope)
Son of a gun!
Just so long as that's a mil spec envelope. Oh wait, that spec was cancelled. Never mind.
Hold on A minute!!!!!!I'm out of popcorn
Hey Wrecker!
CruiserTech? Here, have some popcorn:
I had extra!
You asked for it!
CruiserTech? Here, have some popcorn:
I had extra!
androbot,
What in Hades are you talking about and what is the relation to the thread topic??? Please stop digging a hole. I don't see what relevance all these out of date military specs has on the usefullness of lower viscosity grades. I also think you are overgenralizing nominal viscosity compatability saying that 0w30 can replace 5w20. In normal ambient temperatures the 0w30 will always be thicker than the 5w20. Therefore it is thicker and not as effecient.
What in Hades are you talking about and what is the relation to the thread topic??? Please stop digging a hole. I don't see what relevance all these out of date military specs has on the usefullness of lower viscosity grades. I also think you are overgenralizing nominal viscosity compatability saying that 0w30 can replace 5w20. In normal ambient temperatures the 0w30 will always be thicker than the 5w20. Therefore it is thicker and not as effecient.
Copy that. androbot, you need stop posting all that baloney.
It was these so called out of date military specifications which started the 5w20 synthetic oil revolution in the first place. Back in 1968 5w20 petroleum oils were used in artic weather conditions and caused the destruction of the Detroit Diesel 2 stroke engine. 5w20 synthetic engine oils developed that could be used in the Detroit Diesl 2 stroke at least in cold weather conditions. Oil companies were so impressed by a synthetic oils ability to hold up in a 2 stroke engine that 5w20 synthetic military grade oils were marketed in the 1970's as a fuel saving alternative to 10w40.
Roger that. Splash the 'bot. Repeat, splash the 'bot!
- Joined
- Sep 28, 2002
- Messages
- 39,798
..and...
this means what
Your next post should start out:
This means that...and therefore ...
(insert cogent comments)
..and conclude with..
As you can see, this strongly suggests (or insert "proves that") ....(insert point).
We just keep going around in a circle. There has to be a finish line here. Go to it.
[ August 01, 2006, 12:53 PM: Message edited by: Gary Allan ]
Your next post should start out:
This means that...and therefore ...
(insert cogent comments)
..and conclude with..
As you can see, this strongly suggests (or insert "proves that") ....(insert point).
We just keep going around in a circle. There has to be a finish line here. Go to it.
[ August 01, 2006, 12:53 PM: Message edited by: Gary Allan ]
Androbot is, could be, sounds like, Miro Kerfert the infamous Synlube ring master!
5W30 and 10W30 are the most popular for your average new car here in Oz. You just don't see xW20 on the shelves. Hard to say exactly why but some reasons are:
- People just seem to like thicker oils
- Hardly anywhere gets below freezing (where I live is an exception and we see -7C at worst)
- Summer temps regularly exceed 30C and will hit 35-40C in most places.
I own two turbo Subarus and for both they recommend 5W30. In the WRX I run 10W40 because the car does a lot of trackwork in the heat of summer. I've seen more than one car running 5W30 in summer on the track that did its bearings.
At the first service on my Forester the dealer put in 10W40 semi-synth Mobil. I'll probably end up running it on 10W30 M1 as that is easier to get.
That answers my earlier question about whether you just make your **** up or get it from Amsoil. You obviously make it up yourself. Amsoil weasel words things to make it sound like the have qualified for specs that they really haven't but they aren't full of ****.
- Status
Similar threads
- Locked
- Locked