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Mixing of vicosities #5080870 04/20/19 02:56 PM
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Matt97 Offline OP
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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.

Re: Mixing of vicosities [Re: Matt97] #5080876 04/20/19 03:10 PM
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demarpaint Offline
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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.


God Bless Our Troops

Re: Mixing of vicosities [Re: Matt97] #5080878 04/20/19 03:12 PM
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FordCapriDriver Offline
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If they are the same brand and particular "line" of oils, it's probably ok.... can't really see the point but i doubt it's hurting anything.


1975 Ford Capri II Ghia 3000 V6 - Repsol Elite Super 20W-50
1988 Ford Escort XR3i Cabrio - Shell Rimula R4X 15W-40 HDEO

Re: Mixing of vicosities [Re: Matt97] #5080882 04/20/19 03:20 PM
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D1dad Offline
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My car uses oil so I often end up with who knows what. I usually start out with 5-30 though.

Re: Mixing of vicosities [Re: Matt97] #5080889 04/20/19 03:29 PM
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Triple_Se7en Offline
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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!!!!!!!!!!!!

Last edited by Triple_Se7en; 04/20/19 03:30 PM.

19 Hyundai SantaFe 2.4GDI Castrol Edge 5w30 / NAPA Mann-Hummel filter / 6oz Liqui-Moly Treatment
04 Colorado 3.5 Castrol Edge 0W40 Euro & K&N filter
03 Malibu 3.1 QS / Valv Syn 5w30 mix Fram EG filter
Re: Mixing of vicosities [Re: Matt97] #5080916 04/20/19 04:05 PM
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csandste Offline
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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.

Last edited by csandste; 04/20/19 04:06 PM.

2017 Kia Soul Plus-- VWB 5w30 65,000 miles
Re: Mixing of vicosities [Re: demarpaint] #5081103 04/20/19 07:25 PM
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geeman789 Offline
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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 ...


2011 SUBARU Impreza 5-door manual / 2016 HONDA Pilot / 2011 MAZDA 2 auto
Re: Mixing of vicosities [Re: geeman789] #5081120 04/20/19 07:42 PM
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demarpaint Offline
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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


God Bless Our Troops

Re: Mixing of vicosities [Re: Matt97] #5081127 04/20/19 07:47 PM
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CT8 Offline
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If the client is happy that is all it matte5s.


2015 F150 2.7
2018 F350 6.2
Re: Mixing of vicosities [Re: Matt97] #5081166 04/20/19 08:38 PM
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burla Offline
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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.

Re: Mixing of vicosities [Re: demarpaint] #5081186 04/20/19 09:13 PM
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Matt97 Offline OP
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Hence why i dont question the tactic..in person!

Re: Mixing of vicosities [Re: Triple_Se7en] #5081238 04/20/19 10:10 PM
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CR94 Offline
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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?

Last edited by CR94; 04/20/19 10:11 PM.

2011 Toyota Prius now at 102K
1981 Mazda GLC (323) retired at 606K
1972 Subaru DL retired at 190K
1954 Chevrolet retired at 121K
Re: Mixing of vicosities [Re: burla] #5081310 04/20/19 11:21 PM
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bbhero Offline
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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.


Nissan Altima 3.5 Coupe
Cam2 Dexos1 Gen 2 5w30 Wix 57356 Oil filter
"Treat your family like your friends and treat your friends like your family."
Re: Mixing of vicosities [Re: Matt97] #5081378 04/21/19 04:19 AM
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FordCapriDriver Offline
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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 shrug
It keeps the hydraulic tappets quieter than any oil i have tried.

Last edited by FordCapriDriver; 04/21/19 04:22 AM.

1975 Ford Capri II Ghia 3000 V6 - Repsol Elite Super 20W-50
1988 Ford Escort XR3i Cabrio - Shell Rimula R4X 15W-40 HDEO

Re: Mixing of vicosities [Re: FordCapriDriver] #5081398 04/21/19 06:07 AM
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Matt97 Offline OP
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In what ratio, im assuming they are the same brand?

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