What oil does everyone run?, Not just break in oil! Options

[tscrihfield]

Okay I did a search on oils that people run and my search was less than helpful. I always get the same thing. Brad penn oil... I know that this is good oil and many run this but I would like to know what everyone runs.

So please state the engine your running and what oil you're running.

Thanks,
Thomas

[Brodie]

I've been reading this thread with interest, and I thought that I would email Castrol and see what they recommended for air cooled engines. This is their response when I asked about what oil I should put in my 82 911 SC.


This ticket has been updated by IC - Castrol Representative



Thank you for contacting Castrol North America.

Castrol always recommends following the guidelines of the original engine manufacturer for the recommended grade and API specific to your application. This information can be found in the vehicles owner's manual or by contacting the manufacturer directly.

We do not have oil recommendations based on a specific type of engine. We have specific recommendations based on year, make and model of a vehicle. According to Castrol's lubrication guide recommended for the 1982 Porche 911 is the following:

For Mineral based oil:
Above 14F: 20W-50
Above 5F: 15W-40, 15W-50
-4 to 95F: 10W-40, 10W-50
-13 to 68F: 10W-30
-22 to 32F: 5W-30
Below 14F: 5W-20

Synthetic Based Oils:
32 to 105F: 10W-30. 10W40, 10w-50
All temperatures: 5W-30, 5W-40, 5W-50

Thank you for contacting Castrol.

Castrol Consumer Relations




I imagine that they don't want to stick their necks out too far, and that is why they have made the disclaimer for reading your manual. I would like to know from an oil engineer what have they done in modern oils to replace the zinc and other materials that made the old stuff "good" for air cooled engines. I'll see if I can get a response. Wish me luck!