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DB9 Oil weights and Viscosity

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Old 01-03-2018, 01:50 AM
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DB9 Oil weights and Viscosity

Having brought up this topic on the Corvette and DeLorean forum I know this topic can start a religious debate of sorts on motor oil. But i recently had conversation with a Ferrari and Aston Martin collector about motor oil. He said he used a 15w-50 motor oil in all his V-12 engines due to better protection from "heat soak" after shutdown. Surprisingly he also. Said the 15W-50 had better cold flow than the 0W-40. I was told early DB9 V-12 are extremely sensitive to changes in viscosity which is why so many early models suffered from major internal engine failure. Years back Castol used to make a 5W-50 synthetic specifically for turbo applications. Was wondering if something like this would benefit the V-12. As a rule of thumb I'm continuing to use 0W-40. But I'm curious what others are running in their V-12 and why.

Last edited by Chris P; 01-03-2018 at 01:51 AM. Reason: Spelling error
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Old 01-03-2018, 12:06 PM
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Old 01-03-2018, 01:59 PM
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I use the Mobile1 0W-40 just because that is what is recommended and I've had good luck with it in other cars. I've never heard of post shutdown heat soak being an issue in a non-turbo engine.

The early DB9 oil issues can be traced to a oil starvation issue due to an incorrect length dipstick from the factory. If you have a DB9, make sure you have the correct (new) part number dipstick.
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Old 01-04-2018, 09:34 AM
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Said the 15W-50 had better cold flow than the 0W-40.
and he is wrong
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Old 01-04-2018, 04:35 PM
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and he is wrong
Really. Don't know how anyone could say such an ignorant thing.
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Old 01-05-2018, 08:21 AM
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Really. Don't know how anyone could say such an ignorant thing.
And you would be wrong.

The first weight determines the oil weight when the oil is cold, the lower the weight, the better it flows and that is a given. Though at low outside temps, the difference is probably minimal and also depends on whether you are comparing synthetic to regular oil.
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Old 01-05-2018, 02:45 PM
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All things being equal, a 0w-40 oil will flow better when cold than a 15w-50 oil. There is some variance, though, so not all oils for a given weight range flow the same. There are also differences in quality, but that's a completely different can of worms.

Heat soak after shutdown shouldn't be an issue with a naturally-aspirated engine. That's something that affects turbochargers - the solution for that is to either let the car idle for a while before turning it off, or installing a turbo timer, which keeps the engine idling for a set amount of time after you remove the keys (so you don't have to wait). It's specifically to protect the turbo, and has little (if any) effect on the engine itself.

As was mentioned earlier, the oil starvation issue was due to the original dipstick having incorrect markings, so not enough oil was being put into the engines. It had nothing to do with oil weights/types/etc.
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Old 01-05-2018, 03:02 PM
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https://m.youtube.com/watch?t=905s&v=pzmL2rl1j8Q

in conjunction with this topic. I was curious if anyone else had seen this video and had thoughts on why it failed in such a catastrophic way.
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Old 01-05-2018, 05:07 PM
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And you would be wrong.

The first weight determines the oil weight when the oil is cold, the lower the weight, the better it flows and that is a given. Though at low outside temps, the difference is probably minimal and also depends on whether you are comparing synthetic to regular oil.
No ****. I was agreeing with the commenter, saying the guy who said the 15 weight flowed better in cold conditions was ignorant.
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Old 04-15-2018, 10:26 AM
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Originally Posted by PNW View Post
I use the Mobile1 0W-40 just because that is what is recommended and I've had good luck with it in other cars.

I want to buy motor oil for my Rapide and Mobil1 0W-30 or 0W-40 are recommended in the owner's manual. Also refers to Authority's and Standard's.


There are several formulations of Mobil1; which one should I buy?


What sucks is I have about 10 bottles of the Castrol specific for the Vantage that was big bucks and no longer own the Vantage... If you are a local Vantage owner, I will cut you deal on the oil for a bottle of wine...
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Old 04-15-2018, 07:59 PM
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I sell Motul fluids and use them in both of my Vantages.
https://www.redpants.lol/shop/motul-engine-oil

A lot of people also use Mobil1.

The "recommended" brand of oil is contractual. You can swap between high-quality brands without issue.
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Old 04-16-2018, 06:56 AM
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Originally Posted by Redpants View Post
I sell Motul fluids and use them in both of my Vantages.
https://www.redpants.lol/shop/motul-engine-oil

A lot of people also use Mobil1.

The "recommended" brand of oil is contractual. You can swap between high-quality brands without issue.
Which line of Mobil1 meets the standards and authority's specified by Aston in the owner's manual on the V12?
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Old 04-16-2018, 08:14 AM
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I'm not sure, I haven't looked into it too far because I stick with Motul. Info on oil specs here:
http://www.redpants.lol/blog/2015/12...-unicorn-blood
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Old 04-16-2018, 08:18 AM
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The V8 and V12 have much different motor oil requirements.
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Old 04-16-2018, 08:23 AM
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Oil viscosity and ratings are two different things.
The V8 needs 10w-60, the V12 needs 0w-40.
The blog post goes over the quality requirements for oils (eg, ACEA A3/B3). These quality ratings help show how well an oil performs in operating conditions.
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