924Board.org

Osiris · Joined: 01 May 2003 Posts: 91 Location: Muncie, IN

I always run 20W-50 in the summer as it reaches 85+ quite regularly and switch to 10W-30 in the winter. Does this sound okay? I guess I could run 10W-30 all year long. The manual doesn't list any specific oil weight to use.
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Keep a Chevy motor in a Chevy
Keep a Porsche motor in a Porsche
Keep a Ford motor in the dumpster

'87 924S 50K miles black/black

joecitizennn · Joined: 12 Sep 2005 Posts: 2096 Location: no mans land

I run 5w30 in temperatures below freezing.

Mav666 · Joined: 16 May 2008 Posts: 47 Location: Newcastle, UK

Doesn't really get that cold over here, but on the last change I used 10/40, with the age of the car I'll probably use 20/50 next time though

bcblase · Joined: 23 Oct 2007 Posts: 574 Location: Winchester, VA

A lot of older Porsches are running the ZDDP enhanced oils. Zinc Dialkyl-Dithio-Phosphate (ZDDP) was used in oil up until the late 80's and then removed because of environmental concerns. You can't run ZDDP in newer cars because of the advanced catalytic converters, but it is recommended for older cars like the 924S.

Brad Penn and a couple of other racing oils have it already. And there are several commercially available additives that can be added to regular API rated motor oils.

FWIW, I run Castrol 10w30 year 'round. I am going to start adding a product called "ZDDP Plus" with the next oil change, or switch over to Brad Penn oil (the green stuff).

Just type "ZDDP" into Google and you'll get all the info you need.
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1987 Porsche 924S - track toy
1986 Mercedes 190E 2.3-16v - autocross
2007 F-150 5.4L Lariat Supercrew - tow beast
1994 Volvo 850 Race Wagon - 24 Hours of Lemons Car
2001 BMW 325xi - daily driver

joecitizennn · Joined: 12 Sep 2005 Posts: 2096 Location: no mans land

I used valvoline VR1 for its ZDDP for a while, but switched to Valvoline full synthetic. I have been so pleased with the results I use nothing else, outside of mobil 1.

Using Valvoline full synthetic, my engine oil turns only slightly amber in 3000 miles. It is so clean you can see light through the stream when it is draining. The magnet on the oil plug is always clean too. I remember when running standard oil there would be a grey smudge on the magnet at oil changes. not now

Portporschedon · Posted: Fri Dec 25, 2009 10:30 pm Post subject:

After reading posts on the unsuitability of modern oils for older cars, due to a reduction in ZDDP, I am now using the recommended weight of oil, but for diesel engines.
I mentioned this to a local mechanic and he just said " yep.....that s right!".
The car is in regular daily use with mixed long and short journeys and the only thing I have noticed is that my oil consumption has decreased.

By the way....Merry Christmas!
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White 1983 924 - Renovated to near original condition and my daily driver

Dolomite 1986 924S - Coming to the end of a 4 year refurbishment.

Life is not a rehearsal

Andre' · Posted: Sat Dec 26, 2009 8:45 am Post subject:

jrrhdmust · Joined: 19 Mar 2008 Posts: 180 Location: Middle Georgia

Amsoil 5w30 for me year round....
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67 Mercury Cougar XR7 under Restoration
71 VW Superbeetle Completed Resto 11/07
73 Mustang Mach 1 10 Year old restoration

ic932 · Joined: 11 Feb 2005 Posts: 1104 Location: UK

I use cheapo halfords..the one that says for modern fuel injected cars. I think its the turqoise coloured one? Oil pressure gauge seems to like it.

bcblase · Joined: 23 Oct 2007 Posts: 574 Location: Winchester, VA

Do you still have to buy Amsoil through a local "dealer"? I didn't know it was still around - I used it back in the '80s. I think it was one of the first true synthetic oils?

Brad
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1987 Porsche 924S - track toy
1986 Mercedes 190E 2.3-16v - autocross
2007 F-150 5.4L Lariat Supercrew - tow beast
1994 Volvo 850 Race Wagon - 24 Hours of Lemons Car
2001 BMW 325xi - daily driver

ic932 · Joined: 11 Feb 2005 Posts: 1104 Location: UK

jrrhdmust · Joined: 19 Mar 2008 Posts: 180 Location: Middle Georgia

Absolutely disagree.

I am a gear head big time. Synthetic not only reduces temperatures of the engine, but reducing friction, thereby reducing wear, but it also has a better additive package to reduce internal corrosion. Synthetic is also a lot more resilient to temperature spikes.

Lets say you over heat your car. If you run dino oil at 290 degrees for 5 minutes you have now lost 10 percent of the viscosity of the oil. For every minute over 300 with dino oil you loose 10 percent.

Yes it is more expensive, however since i have now pulled apart the 924s, a Ford 351C, a Ford 289 and a Harly Evo. There is a HUGE difference between the wear and corrosion on the internals of the engine between synthetic and dino.
John
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67 Mercury Cougar XR7 under Restoration
71 VW Superbeetle Completed Resto 11/07
73 Mustang Mach 1 10 Year old restoration

fiat22turbo · Joined: 18 Jan 2006 Posts: 4040 Location: Portland, OR

Keep in mind that like organic food, the meaning of synthetic when it comes to engine oil has been changed to include hydro-cracked oils.

Hydro-cracked oils are just natural oils that has been refined an extra step over other natural oils.

If you're going to step up to synthetic (and you should for motors you truly care about) then do some research on how your oil of choice is made before doing your shopping.
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)

jrrhdmust · Joined: 19 Mar 2008 Posts: 180 Location: Middle Georgia

Browar · Joined: 02 Jan 2003 Posts: 90 Location: Warsaw,Poland

What about 924 S in EU?

At the moment my car runs Mobil 1 5W50.
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Browar
eS
924 S `87