CDH911C2S

I checked the oil and decided that 1/4 qt should be added to my 2006 C2S...I grabbed my wifes Mobil 1 for her car, which is 10W..not the right 0W...I added 1/4 qt before realizing my mistake. Will this do anything adverse to the engine ? Thank you for the help

1999Porsche911

It will only improve the oil protection of your engine. IMO, no one who cares about protecting their flat six should be using 0W40 in warmer climates.

mastiffdog

I have read nearly every thread where you have commented about oil useage. I guess what I don't understand is why the owner's manual for my car recommends three different weight oils (0-40, 5-40 and 5-50) for the 997TT, any of which fall into my temp range for my climate and yet you say that this would not be caring about protecting the flat six.

I bought the 0-40 to top it off one bar after 650 miles, but have not used it yet in my car. I probably need no more than 4 ozs. to top it off. You think that will hurt my engine?

dstrimbu

Porsche recommends 0w-40, 5w-40, or 10w-40 Mobil 1... I agree with '99P911 - the 0w oil is too light for summer temps... good for economy, probably not as good in terms of engine wear...

-don

wross996tt

Show me where...Not in the latest TSB!

jhbrennan

Owner's Manual says 0w-40, 5w-40 or 5w-50 - haven't seen any reference to 10w-40.

bgiere

The right oil is 0w40. You can use 5w40 also...The 0 and the 5 are the cold temp ratings. If you want proper variocam operation use the right oil. A 0w40,5w40 and a 10w40 are all still 40 weights at operating temperature. There are many discussions lately about this and many differing opinions. I can assure you that 0w40 is the correct oil to use n all temps for all applications for the 996 and 997.

1999Porsche911

That's funny about the varicam operation. So many people complaining about engine surge at around 2800 rpm? I don't have that on a warm engine. Head Tech at local Dealer finished testing 996's and 2 997's with his Porsche scanner, and found that the variocam engauges more quickly and positively in the cars that were using a 50W oil other than the OW40. Even moving up to a 5W-50 oil improved the varicam funtion on a hot engine. The only time there was any hestitation of the varicam was when the engine was cold, but this was with all weights of oils tested.

I had already proved this to myself by plotting timing changes with various oils. The 50W is much less abrupt and timing drop recovers 50% faster. It was nice the tech was able to confirm my findings. If you are driving like an old lady or in a climate where temperatures are less than 60F, it does not matter as much.

H20NOO

Your mistake will have NO adverse effect on the engine. It's too little oil out of 8 quarts or so to make a difference. The most important thing is that it was Mobile 1 and not a mineral based oil. I'm sure the service advisor will tell you not to worry about it, unless he's pushing you to bring the car in for an oil change.

MC

H20NOO

I agree with this statement as well. The trend these days is to run very light viscosity oils to improve fuel economy, especially in wet sump engines where windage losses can be significant.

That is not necessarily best for the engine.

MC

bgiere

There as as many opinions as there are oils! Here is a thread from the 996 forum that should have settled the issue....

https://rennlist.com/forums/996-forum/292838-i-m-running-15w50-and.html

also, I am fairly certain that Mobil 1 does not exist in a 10w40 version, regardless adding 1/4 quart will not hurt anything and you will be fine until the next oil change. I would encourage you to read the thread and make your decsions based on facts rather than conjecture.

CosmosC4S

1/4 quart is NOT gonna do anything to harm your engine at all.
Even if you fill the whole thing with 10w, it's still not gonna do any harm.

I just changed my oil and my mechanic put in 15W50, I asked him why and he said that's the best oil for my car in my location.

My opinion is, unless there are extreme temperatures, ALL of the oil will work fine in our engines.

dstrimbu

Sorry, my bad Statman... that's 5w50, not 10w40.

That being said, I don't think that a quart of 10-base-weight Mobil 1 is going to make a big difference - there's 8 quarts in the system.

In TSB 1701 (01/05), there are ONLY 0w- or 5w- base weight oils. No 10w- or 15w- base weights. Interesting.

Thanks for catching me,

-don

gweedo911

I run 15w50 w/ no issues. Probably switch to 0w40 during the winter. I'm not to concerned about the TSB, Mobil 1 is a great product just like Porsche.

skeetshooter

Folks,

Don't forget that part of the design process of an engine takes into account the oil to be used in that engine. Running 15w50 in an engine designed for 0w40 is not doing the engine any favors. Unless you are racing it. Then 15w50 makes some sense.

Scott