I have read that Amsoil tends to thicken with extended drain intervals. Does that include the time portion of the iterval? Meaning, does Amsoil thicken with increased duration of time when it just sits?
Thickening Amsoil
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No the thickening is proportional to the time the engine is running (more or less)
Any shear stable oil will thicken over the course of an extended service interval. The key to maintaining high fuel efficiency is to keep this oxidative and evaporative thickening to a minimum.
In fairness to Amsoil, if you check the oil analysis section you'll see that on average folks using it are running significantly longer change intervals than with other synthetics. As a result the thickening is simply more noticable with Amsoil then a competitive product; changed every 5000-8000 miles.
Tooslick
In fairness to Amsoil, if you check the oil analysis section you'll see that on average folks using it are running significantly longer change intervals than with other synthetics. As a result the thickening is simply more noticable with Amsoil then a competitive product; changed every 5000-8000 miles.
Tooslick
Also note that thickening (just a little) is better than thinning.
Especially when concering a x30 your start thinning and it doesn't take much to get to a 20 or even 10 weight.
Most time over super extended drains it will get to about 13cSt. and stay there for the duration of the drain. this is just barely a 40wt.
Also not that the thinner grades of oil have less of a spread to contend with. So only minor changes in viscosity can bring it out of grade.
For a 20wt oil the viscosity spread is. 5.6-9.29 cSt @100C.
For a 30wt. it's 9.3-12.49 cSt.
But when you go to a 40wt. it's spread in creases, same with a 50wt. which has a 5 point spread.
I know it works on (percentages) which at a higher weight the same percentage will have a higher spread, but still when they are measuring a lower wieght oil there's not much room in there.
Hope this helps
Especially when concering a x30 your start thinning and it doesn't take much to get to a 20 or even 10 weight.
Most time over super extended drains it will get to about 13cSt. and stay there for the duration of the drain. this is just barely a 40wt.
Also not that the thinner grades of oil have less of a spread to contend with. So only minor changes in viscosity can bring it out of grade.
For a 20wt oil the viscosity spread is. 5.6-9.29 cSt @100C.
For a 30wt. it's 9.3-12.49 cSt.
But when you go to a 40wt. it's spread in creases, same with a 50wt. which has a 5 point spread.
I know it works on (percentages) which at a higher weight the same percentage will have a higher spread, but still when they are measuring a lower wieght oil there's not much room in there.
Hope this helps
This is a very generalized statement. As the others have pointed out - it does happen - BUT not with all oils and not in ALL applications. Terry used to call it "lack of solvency"....this is probably partially correct, others say "oxidative thickening", and sure ALL oils oxidize - these term seem to scare people more than they help the explanation. It tends to make people think because Amsoil viscosity increased - the next step is some type of tar filling their crankcase. Also as pointed out - a move up in viscosity one range is perfectly allowable by US API/SAE specifications.
As MS says when the oils do thicken in some cars - and it is somewhat of a controlled rate. Possibly by design.
Honestly - it has NEVER happened in my or any customer's cars - so it becomes of big interest when I see it here on BitOG. Vinu - please go review the last 4 or 5 Amsoil UOA's here and check the vis vs. the starting vis.
It does bother me that it happens - as in big nasty GM blowby V8's. It bothers me that Amsoil corporate does not acknowledge that it happens - however I get the feeling they hear about it.
My father and grandfather both used Amsoil {older produts and todays product line}.
I will honestly say! "I would not and would never be afraid to use Amsoil in any Auto or Marine application.
It is a great oil no matter what viscosity or application.
Is it the Best? That arguement will go on forever. Personaly I don't care.
I trust in all my autos {Old and New}!
Just bought 2 new Turbo Charged Honda Personal Watercraft for my family and I will use Amsoil in them as well... Come on Warm Weather!!
http://powersports.honda.com/waterc...-12X+GPScape&ModelYear=2005&ModelId=ARX12T3D5
I will honestly say! "I would not and would never be afraid to use Amsoil in any Auto or Marine application.
It is a great oil no matter what viscosity or application.
Is it the Best? That arguement will go on forever. Personaly I don't care.
I trust in all my autos {Old and New}!
Just bought 2 new Turbo Charged Honda Personal Watercraft for my family and I will use Amsoil in them as well... Come on Warm Weather!!
http://powersports.honda.com/waterc...-12X+GPScape&ModelYear=2005&ModelId=ARX12T3D5
The question should be "Does Amsoil thicken more then a $5 to 9$ qt of oil should?" and the answer is YES. Mobil 1 is a far better value right now then Amsoil. M1 EP was tested for 2 years in severe conditions. I'm sure it will hold up fine. Don't think for a minute Amsoil doesn't formulate to meet a price point. Example: THE XL line went from PAO to Group III. Can you ever envision Redline doing that?
Good stuff but should be better. It's hard to beat Mobil 1. I personally think the Conco/MC/Havoline's etc. are the best values among all oils right now, including synthetics.
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