03-28-2014, 06:38 AM
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#1
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Registered User
Join Date: Apr 2011
Location: Alabama
Posts: 487
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Blended Oil Cocktail, simple Q for smarter people
Ok, so I've started doing my own oil changes. My preference, after much review of the info here and elsewhere, is for Castrol Syntec 5w40, which is rare as hen's teeth around here.
Mobil 1 in 0w40 (Porsche approved) and 10w40high mileage is readily available and relatively cheap. If I blend the M1 0w40 and 10w40hm will this result in an appropriate 5w40 weight oil for my '01S?
Or suck it up, pay the extra, and order the Castrol in the correct weight?
Thanks in advance for the education.
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03-28-2014, 07:26 AM
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#2
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,619
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Quote:
Originally Posted by BrokenLinkage
Ok, so I've started doing my own oil changes. My preference, after much review of the info here and elsewhere, is for Castrol Syntec 5w40, which is rare as hen's teeth around here.
Mobil 1 in 0w40 (Porsche approved) and 10w40high mileage is readily available and relatively cheap. If I blend the M1 0w40 and 10w40hm will this result in an appropriate 5w40 weight oil for my '01S?
Or suck it up, pay the extra, and order the Castrol in the correct weight?
Thanks in advance for the education.
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Maybe. Different oil manufacturer's often start with completely different blend stock bases, then use their own additive packages to put the oil into the weight characteristics they want. So blending two different brands of oil could easily take you just about anywhere viscosity wise.
You would be vastly better off not playing "mad chemist" and buying the correct oil. Either go for the Castrol 5W-40, or better yet the Joe Gibbs DT 40.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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03-28-2014, 09:57 AM
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#3
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Beginner
Join Date: Mar 2013
Location: Houston
Posts: 1,659
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Quote:
Originally Posted by JFP in PA
Maybe. Different oil manufacturer's often start with completely different blend stock bases, then use their own additive packages to put the oil into the weight characteristics they want. So blending two different brands of oil could easily take you just about anywhere viscosity wise.
You would be vastly better off not playing "mad chemist" and buying the correct oil. Either go for the Castrol 5W-40, or better yet the Joe Gibbs DT 40.
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+1 based on memories of a fuels and lubes class I had about 30 years ago.
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2003 S manual
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03-28-2014, 10:26 AM
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#4
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Registered User
Join Date: May 2011
Location: Essex, CT United States
Posts: 301
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Synthetic oils start with the lower viscosity base stock with an additive package that brings the higher viscosity when hot, dino oils the opposite.
That being said, I'd just buy the same oil across the board. I've been using M1 0W40.
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2002 Boxster S, Arctic Silver, 18" Turbo Wheels, 6-speed
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03-28-2014, 04:00 PM
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#5
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Registered User
Join Date: Apr 2011
Location: DFW
Posts: 713
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Don't mean to thread jack but, what about changing to the heavier oil around the summertime when it gets real hot, and then back to a say 0-40 for the cooler parts of the year? Use to do this on recommendations from a mechanic friend. But this was not on Porshes by the way.
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What we're dealing with here is a complete lack of respect for the law.
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03-28-2014, 07:10 PM
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#6
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Registered User
Join Date: Apr 2011
Location: Alabama
Posts: 487
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Thanks guys.
JFP's logic of different additives not having a cumulative effect on oil weight makes sense, and since there is no telling if Mobil 1 is consistent in using the same additives for viscosity throughout their line...
I'll steer clear of cocktails and boatdrinks for my car and just stick to a single malt beverage, paying extra and waiting a bit to get a good marque (Castrol Syntec) if I have the time, sipping the local (M1) brew if the time window is tight.
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