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cjbear11 · Joined: 22 Oct 2013 Posts: 5 Location: Lafayette, Indiana

Without trying to start up a gigantic thread about oil, I have a simple question in regards to which is the best or preferred type to use in my 924S. 10w30/40 or 20w50? The PO alluded to 20w50 being better to use in this car than 10w30, which doesn't entirely make sense to me. Any truth to that? I'd like to use high mileage oil in the 'ol girl until I rebuild the engine, but that's only available in 10w. Thoughts?

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

I run 5w40 LiquiMoly in my 2.5 race car. FWIW, Porsche now recommends 0w40 Synth for "all sports cars."

*flame suit on*
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morghen · Joined: 21 Jan 2005 Posts: 9095 Location: Romania

20W is pretty thick...unless you plan on using this car in the summer i'd say 20W is too thick. As far as i know 20W will probably cause very high oil pressures in the winter with the cold engine....high pressure does not necesarilly mean a good thing. Pressure can be the indicator of lack of flow...you get my drift.
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vatoisimo · Joined: 31 Aug 2008 Posts: 134 Location: Kent, Wa

Rasta,

what do you run in shaggy?

emoore924 · Joined: 13 Apr 2004 Posts: 2822

I run 20w50 Brad Penn in both the race car and the turbo. BUT I don't run the cars in the winter.

There's a scale in the owner's manual that says what viscosity to use given the expected ambient temp range. I imagine Porsche's "all sports cars" comment probably means *current* vehicles, not the ancient pieces we drive.

924RACR · Posted: Sat Nov 02, 2013 9:02 pm Post subject:

I would DEFINITELY not run 0W anything in any of our cars. Not even on the racetrack.

Yes, new cars use it. They're designed for it. Under some circumstances.

Rasta, I hope you're logging data on your oil pressure...

We use 20W50 or 40wt Valvoline VR1 race oil in the #77. In my turbo, it's been Mobil 1 10W30... though with a fresh engine on the ramps, I'll probably be breaking 'er in with the Brad Penn stuff.

cjbear, I'd say you should be fine with 10W30 or 40... what's your oil pressure doing? One good thing is with the 2.5L you do have the oil cooler, so it's less likely to need a 20W50 on the street, even in the summer...
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WEASEL149 · Joined: 19 Aug 2005 Posts: 595 Location: UK, Sheffield

TJC · Posted: Sun Nov 03, 2013 1:08 am Post subject:

When we had our '87 924S I ran 0W40 Mobil 1 in it with good results...i.e. no problems or leakage and proper oil pressure. I also run it in the '92 and '95 BMW's as well as the MINI. I would run it in the 635, but I would want to get that engine "sealed up" first

.

Remember that, in simple terms, multi viscosity oils "act" like a certain weight at a certain temperature meaning the colder the temperature the lower the weight and vice-versa as opposed to the old single weight Dino oils which don't have that characteristic.
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Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

Switched Shaggy and the race car from Penn 20w50 to LiquiMoly 5w40. There had been no change in oil pressure and I would say Shaggy revs a little freer and his girl efficiency is up.
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fiat22turbo · Joined: 18 Jan 2006 Posts: 4040 Location: Portland, OR

924RACR · Posted: Sun Nov 03, 2013 4:09 am Post subject:

skytrooper · Joined: 29 Aug 2007 Posts: 461 Location: Canandaigua, NY

I have used 20w50 almost exclusively in my 924S. I tried 10w30/40 a couple times but didn't like the oil pressure. I run my car from after the April rains until late fall and have never had any problems. My car only has 53k on it so maybe it is tighter than most. I don't know, but 20w50 is the best for me.
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1987 - 924S "Black Pearl"
1982 - BMW 633CSi
1984 - BMW 528e
1983 - 944 N/A "Blue Max" (Gone)
1981 - 931 "Scarlet Harlot" (Gone)
1976 911S Targa (Gone)

cjbear11 · Joined: 22 Oct 2013 Posts: 5 Location: Lafayette, Indiana

Thanks for the replies. Sounds like oil types are all over the board. I went ahead and put in the 10w30 high mileage. My oil pressure before the change was right in the middle of the gauge at idle, and around 4-5 at speed. No difference, or very little difference anyway, in pressure with the 10w30. It seems to run a bit smoother with this oil actually.

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

I now run 20W50 Brad Penn in all of my cars. I rarely drive them now in the winters, but when I did, I would switch over to 10W40 Castrol (one of the few fully synthetic oils available off-the-shelf).
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ditch68 · Joined: 29 Sep 2008 Posts: 126 Location: Tucson, Az

I run 20w50 in both the 924 and the 951, but I do live in Arizona.

Jeff
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