Hi,

Untill now I used oil Mobil 1 0W40 to change the engine oil of my 996TT.

However, I would like to use GULF FORMULA S 5w-40 (porsche approved) in the next oil change. I can buy the Gulf oil for a great price (50% less than the Mobil 1).

The viscosity is different between these oil. I will go change 9L and the others 3.5L (old Mobil 1) will go mix with the new oil (Gulf Formula S).

Can I do it? Or I should continue use the Mobil 1?

Thanks

 

No problem. I switched to 5W50 two years ago.

 

use one or the other, but don't "mix" them. unless it's an absolute emergency.

 

Agreed, That being said NAPA still sells mobile1 for 5.79/qt(5w50)

 

Hi,

To not mix the oils I will need to remove all the mobil 1.

But by the regular process I can only remove 9L the othes 3.5L stay inside the engine and hoses and will be mix with the new oil...

What I have to do to remove all the oil (12.5L)? Is it really necessary?

Thanks,
VS

 

Well anyone who has ever changed viscosity after the factory fill has had this issue..weather they were aware of it or not.
Would draining the turbos get more oil out? How much?

 

removing all the old oil when changing is a very good idea. far as i know, there are two places you'll need to drain, ( crank and oil pan? ) and the turbo's hold about a liter and most people don't bother draining them ( 3rd drain location ) as the amount of oil is neglegible. i drained my turbo's once and they began to cavitate after oil change so i won't do that again. there's an oil change DIY around here somewhere. perhaps someone can post the link or i can send it to you later or post it. change all your oil, replace with one type. good luck.

 

I found some DIY about oil change, but all of then indicate 2 drain locations (crank and oil pan). With this we can remove only 8.5L of oil!

Please, if you know put here the description of the process to remove all the oil.

Thanks

 

i'm posting from my iphone. i cant acess the DIY right now, but i'll post it later if someone else doesn't first. the DIY should certainly include the turbo drain plugs.
that will drain ALL the oil.

 

I use Pentosin 5w40 and love it. Go for the change from 0w40.

 

i'm also using 5/40 for summer.

 

Here I copied and pasted this from another thread in this very forum....

Do you guys really think that manufacturers of oils really want to risk the legal implications of using chemicals that would not blend with many of the other manufactures oils or even different viscosities, at least if they did they would put some strongly worded warnings on their labels.

Here this is right from Valvoline’s web site, then some others.......

Switching between conventional and other types & brands of motor oil is bad for my engine.
Conventional, synthetic blend, synthetic, and high mileage motor oils are compatible. Mixing or switching between types & brands of motor oil is not harmful to your engine.


» I converted the customer from 'Company X' to Valvoline and the customer reported sudden increase in oil consumption. Is my product at fault?
This classic complaint can happen in < 5-10% cases when changing brands of motor oils. This has been occurring for years, and can occur when changing from one brand to the other (same company), as well as one company to another.

Remember, in all such changes, increase in consumption of oil is observed for a short period of time (1-2 change intervals), and then returns to the previous low level. Interestingly, if one returns to the original brand, higher oil consumption is again observed!
» Can we mix two different brands of engine oils?
Technically it is possible to do so provided the new oil has the same performance level as the old oil. However, mixing oil brands (read topping-up) on a continuous basis is not a good idea. You should also be aware that engines typically go through a period of adjustment when making the transition from one oil to another. Because brands could be formulated with different additive chemistries, a new brand may act differently than the old one at first. Increased oil consumption and leaking seals are common adjustment problems.


Can AMSOIL motor oils be mixed with other brands?
Answer: Yes. AMSOIL motor oils can be mixed with other motor oil brands; however, mixing AMSOIL products with other brands may decrease the effectiveness of AMSOIL oils and compromise their extended drain capability. Mixing other oils with AMSOIL motor oils also may void the AMSOIL limited warranty.


Shell -- Specifications and approvals
Because lubricants vary in quality, universal criteria are used to describe oil performance and usage. Shell motor oils not only meet these increasingly demanding international specifications but usually surpass them.
Our scientists perform a variety of tests that measure the ability of Shell oils to resist breakdown and disperse dirt. We also test our competitors’ oils, so that we can benchmark our lubricants and demonstrate the benefits of using Shell Helix oils.

We also realize that real world usage requires compatibility with other oils that are available within specific market areas.


I know that there are instances of incompatibility out there in the market place; but much of what is shared about these subjects is folklore and myth that is propagated on forums such as this one.

So many people Pine and worry over the details such as getting the absolute very very very best oil in the world yet most wear occurs at start up or due to human error.

If someone was worried about engine life and oil issues you would be better off getting a pre-oiling system installed on there car.

The people saying..... (OH NO DO NOT MIX THEM BECAUSE THE SKY IS FALLING) are really mis-informed. So much gets said on forums that has no basis on fact; by people that have no expertise on the subject other than the wives tales they assimilated from someone else that was as equally ignorant to the truith.

 

this is the full DIY link with pictures courtesy of moderator bbywu. search is an incredible feature

https://www.6speedonline.com/forums/...-m97-70-a.html

 

You're ok. The word is from the Porsche approved oils list and other the other info it contains is approved oils can be mixed.

This means that when you change the oil and if you change to a different viscosity (move from 0w-40 to 5w-40 or even 5w-50) and even change brands as long as you stay on the approved oil reservation there is no concern.

I mean if Porsche isn't worried, I'm not worried.

Now Porsche does go on to say (write) that if one is topping up the oil that the same oil that is in the engine should be used for topping up, but in an emergency of course this can be well, ignored. Up to a point. Only an approved oil should be used.

This doesn't appear to be a hardship to me. If anyone gets caught out with an extremely low oil level to the point the display flashes and it is add oil or else before the engine is started and run any and person doesn't have a quart or two of a suitable oil in the car to use for topping up... Shame!

Sincerely,

Macster.