Boxster racers and hpde folks: what oil do you run and how often do you change it?

[steved0x]

Just wondering what folks are using and why. If the info is not something you want to share publicly, if you pm me I will respect your confidence. In case the oil is a secret ingredient to your winning formula and you don't want the competition to know.

[j.fro]

in my autocross car (7500-10k yearly, 15-20 events) I change every 5000 miles. In the summer I use Castrol Edge 10W-40. In the winter I go to 0W-40. A sample goes to Blackstone labs for analysis with each oil change. Same goes for my 996 daily driver ( 30k yearly) but interval goes to 7500 miles and I do analysis every other change.

[rastta]

I run Mobil 1 0-40 in both my Boxster race car and my Cayman S daily. Change the Boxster every 4-5 track days depending on the number of sessions. Cayman S every 5k. At $23 for 5 quarts - I don't worry about it.

[steved0x]

Some good data points, thank you.

[Topless]

I ran Castrol 5W40 full synthetic for 10 years and changed it every 3k miles. Compression was still good when I sold the car at 112k miles and 100+ track days. Noticeably less startup chatter than with 0-40 I used before.

[LAP1DOUG]

Red Line 10 W-40 year round, though I very rarely start the engine when the ambient temperature is below 50 F. I run Red Line straight 40W racing oil (very high ZDDP) for mid-summer track events.

[JayG]

I run M1 0w-40 and change it every 3-5k miles depending on track days. I change it before every track weekend unless it has been under 2k miles since the last change.

I figure changing the oil is cheap insurance

I have a magnetic drain plug and just added magnets on the oil filter housing

I change my 996 every 5k miles or 6 months as it does not get tracked or run at AX

[seningen]

Amsoil 20/50 racing.

Change it depending on the # of track days.

Mike

[thstone]

Mobil 1 10W-40 High Mileage formula. Changed every 4 track days (typically two race weekends).

[steved0x]

Very good info, thanks.