How do u estimate viscosity when mixing oils?
- Thread starter saaber1
- Start date
- Status
http://www.geocities.com/CapeCanaveral/3655/VI.html
I used to have other pages but the links went defunct.
I used to have other pages but the links went defunct.
http://www.rohmax.com/rohmax/en/customerservices/calculationtools/baseoilmixtures/
Using the first calculator I got 11.35 cst.
Using the first calculator I got 11.35 cst.
Wow, great links. Thanks! (Bookmarked!)
Seems like adding only 1 quart of the thicker stuff just gives you a minor bump.
A 3 to 2 ratio puts it at a low 40 weight/high 30 weight starting point which is about where many 502 oils either start at or get to very quickly.
5W30 has moly and Boron while the 5W40 is a different formula with no Moly and little Boron. Maybe it would be better to leave out the 5W40 and use 10W40 instead so that they are more similar formulas.
Those are great sites for playing with options for different "witches brews" ha ha.
Seems like adding only 1 quart of the thicker stuff just gives you a minor bump.
A 3 to 2 ratio puts it at a low 40 weight/high 30 weight starting point which is about where many 502 oils either start at or get to very quickly.
5W30 has moly and Boron while the 5W40 is a different formula with no Moly and little Boron. Maybe it would be better to leave out the 5W40 and use 10W40 instead so that they are more similar formulas.
Those are great sites for playing with options for different "witches brews" ha ha.
I get close to that result with an ordinary average:
( 10.6 x 4 + 15.1 ) / 5 = 11.5
If I put in 5 quarts of 10.6 cSt I get:
( 10.6 x 5 + 15.1 ) / 6 = 11.35
( 10.6 x 4 + 15.1 ) / 5 = 11.5
If I put in 5 quarts of 10.6 cSt I get:
( 10.6 x 5 + 15.1 ) / 6 = 11.35
I like using these to create mad blends.
50% Penz HM 5w30
25% Penz HM 10W40
25% PP 5W30
76.5cst@40C
12.1cst@100C
VI=155
50% PP 5W50
50% PP 5W30
69.5cst@40C
12.1cst@100C
VI=173
50% Penz HM 5w30
25% Penz HM 10W40
25% PP 5W30
76.5cst@40C
12.1cst@100C
VI=155
50% PP 5W50
50% PP 5W30
69.5cst@40C
12.1cst@100C
VI=173
Despite much reading on the subject, I have not seen any research on the HTHS viscosity of a mixture of two oils.
I think that your HTHS estimate from a mixture will be in the ballpark if you plug the HTHS viscosities into the viscosity calculators, treating them as kinematic viscosities at 100C.
I think that your HTHS estimate from a mixture will be in the ballpark if you plug the HTHS viscosities into the viscosity calculators, treating them as kinematic viscosities at 100C.
Good idea. If I plug in numbers for 4 quarts RL 10W30 and 1 quart RL 10W40 then I get HTHS of 3.95 and kv100 11.37. So lighter than GC but a high HTHS. I would think the "with moly" additive pack of these two oils would be similar also.
It would be an interesting test in the 2.0 FSI with how hard it is on oil. Looking at that last RL 5W40 UOA, the iron levels are as flat as a pancake now so I am not sure I can learn much more on the 5W40. I am not brave enough to go all the way down to 10.7 cst (10W30) on this engine until I learn more. Maybe a 3/2 ratio or 4/1 if I'm feeling brave ha ha.
It would be an interesting test in the 2.0 FSI with how hard it is on oil. Looking at that last RL 5W40 UOA, the iron levels are as flat as a pancake now so I am not sure I can learn much more on the 5W40. I am not brave enough to go all the way down to 10.7 cst (10W30) on this engine until I learn more. Maybe a 3/2 ratio or 4/1 if I'm feeling brave ha ha.
- Status
