Mixing of vicosities

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I have a client who mixes 15w40 and straight 40 oil together in equal doses. Brings it to me when I service his vehicle, Hyundai Ldv diesel.
What is the point and does anyone else do this?
My client swears by his 'grade'.
I cannot see the point of doing this at all.
 
Some people think they're making some magic elixir, a hybrid viscosity perhaps. Maybe for the sake of argument an 18w40, 19.5w40, 30w40, or some other imaginary viscosity that doesn't exist. Some think that simple math works for calculating viscosity. EG if you mix 0W20 and 0W30 in equal parts you get 0W25. The debates get heated, and are often entertaining.
 
My car uses oil so I often end up with who knows what. I usually start out with 5-30 though.
 
Originally Posted by Matt97
I have a client who mixes 15w40 and straight 40 oil together in equal doses. Brings it to me when I service his vehicle, Hyundai Ldv diesel.
What is the point and does anyone else do this?
My client swears by his 'grade'.
I cannot see the point of doing this at all.

You may not see the point. But that client's vehicle sees the point clearly..................... in results.
Too many folks buy what they want or desire, instead of the vehicle wants and desires. We see this especially with oil filters. A buyer purchases high efficiency trapping when the vehicle was made to have a filter that's less restrictive.

Feed your vehicle what it wants. It knows what's best for it............................ wait, too many its!!!!!!!!!!!!
 
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Used 5-20 Maxlife on first two oil changes on '17 Soul. Second one was a half quart down, probably because the tech thought I had a 1.6. Threw in a quart of Harvest King synthetic 5w30. Next two changes were VWB 5w30 and now using ST synthetic 5w30.

Only the Maxlife-HK mix used any oil. Refilled with the remaining half quart of HK at about 5000 miles. A quart per ten thousand miles is meaningless, but interesting that only the brew oil showed any change. This was the Citgo oil, think they've changed sources since.

Think I've noticed VWB using slightly more than Maxlife on previous cars (13 Rio 1.6), but the VWB didn't burn a bit on my two 5000 miles changes on this car.
 
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Originally Posted by demarpaint
Some people think they're making some magic elixir, a hybrid viscosity perhaps. Maybe for the sake of argument an 18w40, 19.5w40, 30w40, or some other imaginary viscosity that doesn't exist ...



Ahhh, but they do exist ! HKS, a Japanese tuner company, sells motor oil in a variety of flavours, including :

7.5W33 , 7.5W44 , and even 7.5W55 ... ! Seeing as there is no 7.5W winter classification, or a 33 , 44 or 55 hot temperature grade, they are just making stuff up ...
 
Originally Posted by geeman789
Originally Posted by demarpaint
Some people think they're making some magic elixir, a hybrid viscosity perhaps. Maybe for the sake of argument an 18w40, 19.5w40, 30w40, or some other imaginary viscosity that doesn't exist ...



Ahhh, but they do exist ! HKS, a Japanese tuner company, sells motor oil in a variety of flavours, including :

7.5W33 , 7.5W44 , and even 7.5W55 ... ! Seeing as there is no 7.5W winter classification, or a 33 , 44 or 55 hot temperature grade, they are just making stuff up ...

And people are buying it too. I wonder if they're mixing it to make their favorite imaginary grades from imaginary grades.
wink.gif
 
Some 0w40's may have an additive package someone wants but doesn't want to run the thicker oil, case and point PUP 0w40 with it's 250ppm moly count added to 5w20 PUP's 60ppm moly count, you end up with an aprx 5w30 but with a higher moly count then if you just bought 5w30 PUP. Actually a fairly popular strategy on the hemi forum.
 
Originally Posted by Triple_Se7en
... A buyer purchases high efficiency trapping when the vehicle was made to have a filter that's less restrictive. ...
Ha-ha! You really think so?
 
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Originally Posted by burla
Some 0w40's may have an additive package someone wants but doesn't want to run the thicker oil, case and point PUP 0w40 with it's 250ppm moly count added to 5w20 PUP's 60ppm moly count, you end up with an aprx 5w30 but with a higher moly count then if you just bought 5w30 PUP. Actually a fairly popular strategy on the hemi forum.



True ^^^^^^^

People do that indeed at times.
 
I run a cocktail of 15W-40 and 20W-50 in my Escort and it seems to like it more then either oil on its own
21.gif

It keeps the hydraulic tappets quieter than any oil i have tried.
 
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A few years ago I scored a few 5 qt. jugs of M1 0w30 for $5 (or $10...
I forget) each at the AZ 'clearance'......I would have no qualms mixing it with AFE 0w20 to form a thicker 0w20....or as DP says...an 0w25....While mixing is not a great strategy IMO, if done using oils with similar additive chemistry...it's OK...
 
Originally Posted by CR94
Originally Posted by Triple_Se7en
... A buyer purchases high efficiency trapping when the vehicle was made to have a filter that's less restrictive. ...
Ha-ha! You really think so?

Not funny! Stick around for another 10 years here and read the comments in the Oil Filter Room here yourself.
Some do the reverse to what's best for their rides.
 
Originally Posted by Triple_Se7en
Originally Posted by CR94
Originally Posted by Triple_Se7en
... A buyer purchases high efficiency trapping when the vehicle was made to have a filter that's less restrictive. ...
Ha-ha! You really think so?

Not funny! Stick around for another 10 years here and read the comments in the Oil Filter Room here yourself.
Some do the reverse to what's best for their rides.


We've been on this Merry-Go-Round, the Ultra, and other synthetic media high efficiency filters, can actually flow BETTER than the "rock catcher" filters.
 
Originally Posted by OVERKILL
Originally Posted by Triple_Se7en
Originally Posted by CR94
Originally Posted by Triple_Se7en
... A buyer purchases high efficiency trapping when the vehicle was made to have a filter that's less restrictive. ...
Ha-ha! You really think so?

Not funny! Stick around for another 10 years here and read the comments in the Oil Filter Room here yourself.
Some do the reverse to what's best for their rides.


We've been on this Merry-Go-Round, the Ultra, and other synthetic media high efficiency filters, can actually flow BETTER than the "rock catcher" filters.



Maybe but the only data we have is from Fram and the only examples are cherry picked examples from one or two filters. A former Fram employee was very adamant Fram would provide data throughout it's product line about year later and Nada.
 
Originally Posted by dave1251


Maybe but the only data we have is from Fram and the only examples are cherry picked examples from one or two filters. A former Fram employee was very adamant Fram would provide data throughout it's product line about year later and Nada.


You may have missed the information I posted from Cummins/Fleetguard then.
 
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