158k high mileage oil recommendations ?

[Box7774]

Thanks for all the replies and for not crushing me for the lack of a thorough search. 5 or 6 replies and everyone is doing something a little different.

I have no idea what is in the car right now......can I assume that the left over oil in the car will mix ok with the new full synthetic that I choose? This car will be a Spring summer and fall car only and garaged for the winter. I will put very few miles per year...maybe 3 to 5k tops. I am leaning towards M1 mostly because I believe its what the previous owner was runnin'

again.....thanks for the replies!!!

[78F350]

Originally Posted by Box7774

... I have no idea what is in the car right now......can I assume that the left over oil in the car will mix ok with the new full synthetic that I choose? ...

The residual oil left in the engine by a normal oil change will be fine mixing with the new oil. If you do top it off again later, you should use the same oil that you used in the oil change.

At 158k miles with no warranty concerns, Mixing brand "X" with brand "Y" to top it off should even be okay if you have to, but try to avoid mixing different oil grades beyond what was left behind when you changed the oil.

There's still a lot to be gained by reading some of the old "What is the best oil" threads. Informative and entertaining.

I have a few 986 Boxsters and have used Castrol Edge 10W-40, M1 0w-40 & 10W-40, and Shell Rotella T6 5W-40. Some companies change their additive formulation regularly without notice. Some companies all dip from the same general supplier's vat and put their label on it. I try not to stress myself over the choice.

...and if you love your car, really love it, flush the engine and use nothing but Joe Gibbs 'Driven' DT40. It actually is the best, but at 158k miles ...meh.

[78F350]

And one more thing. Assuming you still have the stock filter and not a spin-on adapter, buy a new "Oil Filter Cover Cap". The bypass valves wear out over time and miles. The Genuine Porsche brand comes with a filter for just $21.50 at Pelican:

https://www.pelicanparts.com/More_Info/99610702055M100.htm?pn=996-107-020-55-M100&bt=Y&fs=0&SVSVSI=4391

[10/10ths]

....PORSCHE now recommends 5w-50 for the 986.

See here:

https://www.porsche.com/usa/accessoriesandservices/classic/genuineparts/producthighlights/motoroil/

[Frodo]

Originally Posted by 10/10ths

....PORSCHE now recommends 5w-50 for the 986.

See here:

https://www.porsche.com/usa/accessoriesandservices/classic/genuineparts/producthighlights/motoroil/

That's a vid about Porsche-developed oils for 356s and air-cooled 911s..

[10/10ths]

.....if you scroll down, you will see the new 5w-50 986/996 Porsche Classic oil.

Just scroll down.

[Frodo]

Ah...never forget to scroll, eh?

[ExplorerLyon]

Originally Posted by 10/10ths

.....if you scroll down, you will see the new 5w-50 986/996 Porsche Classic oil.

Just scroll down.

That is some expensive oil. About $80 for 5L.

[paulofto]

Originally Posted by 10/10ths

....PORSCHE now recommends 5w-50 for the 986.

See here:

https://www.porsche.com/usa/accessoriesandservices/classic/genuineparts/producthighlights/motoroil/

Since Porsche doesn't manufacture motor oil, what are the chances that this 5W50 'classic' oil is Mobil 1 5W50?