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 Post subject: Mixing oil viscocity
PostPosted: Mon Aug 15, 2016 4:57 pm 
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Big Block
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Joined: Tue Feb 23, 2010 12:40 pm
Posts: 3245
Car Details: '79 Camaro, 350 V8
Location: South Bucks
Just wondering - what would happen if you took 2.5 litres of 15w50 and 2.5 litres of 10w30 and poured them in (same brand, product line etc. just a viscosity difference). Would you end up with a 12.5w40? or is that not how it works?

I ask because i would like to run 10w30 or 10w40 but the supplier only has those in 1 litre bottles. They do a 15w50 in a 5 litre bottle and it's much cheaper, but don't want to run that heavy of an oil. Have 10w40 in there and the oil pressure is around 50psi at start up and about 40 when running. So was thinking of putting in half and half.

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Mixing oil viscocity

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 Post subject: Re: Mixing oil viscocity
PostPosted: Tue Aug 16, 2016 12:52 pm 
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Big Block

Joined: Mon Mar 09, 2009 12:13 pm
Posts: 199
Car Details: 1979 Camaro
No real life experience or technical knowledge to back it up, but we've had similar discussions on a bike forum regarding mixing of fork oils to get a mid-weight.

The 'wisdom' seems to be that you can mix oils of the same type, but you won't get the logical viscosity, i.e 10w + 15w comes out around 12, not 12.5.

Not sure if the same applies with multigrade oils though, as their properties vary with heat.

Can't you find another supplier that does the oil in the size/price you want?


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 Post subject: Re: Mixing oil viscocity
PostPosted: Tue Aug 16, 2016 8:14 pm 
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Big Block

Joined: Sun Jan 01, 2012 5:00 pm
Posts: 342
Car Details: Couple of '70 Mustangs
No problem mixing oils, we used to mix 50/50 fully synthetic with mineral as per Vizard's recommendation. My take: the wrong oil is better than no oil or not enough oil. More of a concern is the ZDDP content, assuming it's a FT cam. But you already knew that.
Cheers, Martin

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 Post subject: Re: Mixing oil viscocity
PostPosted: Wed Aug 17, 2016 6:47 am 
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Big Block

Joined: Thu Jul 21, 2011 2:16 pm
Posts: 815
Car Details: 1980 2nd Gen, 6.0 iron block LS, 4.11 12 bolt axle, Brute Strength Posi, Lowered 2", sub frame connectors, G-braces, Carbon hood and front bumper cover
Location: Norfolk
Phone Mark at Wasp, he keeps Kendall Liquid Titanium in stock in 5w30, 10w40 and 20w50. Its about £6 per quart... No more expensive than other fully synthetic oils and it has plenty of zddp

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 Post subject: Re: Mixing oil viscocity
PostPosted: Wed Aug 17, 2016 11:26 pm 
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Big Block
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Joined: Tue Feb 23, 2010 12:40 pm
Posts: 3245
Car Details: '79 Camaro, 350 V8
Location: South Bucks
Thanks for the advice :thumbup:

Sounds ok to mix then, i remember reading something about the viscosity mix ended up not as you would expect i.e. 10 + 15 = 12 instead of 12.5. I realised in my original post i made a typo and put 15-30 whereas it should have been 15-50 (edited the original just now). That probably explains more why i was asking, as 50 and 30 are bit more of a difference than 10 and 15.

Ye, looked into the manufacturers website and they only do 15-50 in 5 litres (£39), everything else is in quarts (£10). It would be cheaper to get the 15-50 and mix in half of 10-30.

Yep - as far as i can tell it's flat tappet (haven't had the rockers / intake off so not 100%). Don't think it's been converted to roller, i would definitely not be stressing a much about the oil if it were a roller :) Working on the assumption it's flat tappet just to be safe.

Have heard of the kendall titanium before, will look into it then if WASP can get hold of it. Sounds quite price friendly in comparison!

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How to post pics: When writing a message, scroll down and use the "attach file" option. Where possible, a photo sharing service can be used such as Flickr, Imgur etc. The image location (usually ending in .jpg) can be copy and pasted between the ][ brackets that appear when you click the 'Img' button (you can find this button at the top of the message box).

How to post youtube vids: Click on the 'youtubeHD' button at the top of the message box and in the middle of the ][ brackets that just appeared, copy and paste everything from the youtube web address that appears after the = sign i.e if this is the url: https://www.youtube.com/watch?v=K2cNqaPSHv0 just copy "K2cNqaPSHv0").


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