924Board.org

juno · Posted: Sun Jul 25, 2004 9:34 pm Post subject: Oil

What's the best oil for my 92k 931? The PO used 15/40 part synthetic. Should I be spending the extra on fully synthetic?
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1980 924 Turbo RHD. 3" > 2.5" Stainless straight-through exhaust.

Paul · Posted: Mon Jul 26, 2004 2:54 am Post subject:

Some of us use Mobil 1 15w-50 available in the States in a 5 quart jug for under $20.

Smoothie · Posted: Mon Jul 26, 2004 8:33 am Post subject:

I've had only Mobil 1 full synthetic in it since I got the car over 10 years ago (sometimes 10W-30, the rest 15W-50). It seems to have been good for the turbo (KKK factory rebuilt) which has over 50,000 miles and is still running strong - and never had a problem with oil leaks from anywhere on the turbo or engine.
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"..it's made in Germany. You know the Germans always make good stuff."

'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

juno · Posted: Mon Jul 26, 2004 10:43 pm Post subject:

So I should be okay running 15w/50 in British summertime, then 10w/30 in the cold winter?

I presume the 15w/40 that's in it will be okay for 1000 miles or so?
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1980 924 Turbo RHD. 3" > 2.5" Stainless straight-through exhaust.

numbbers · Posted: Tue Jul 27, 2004 10:49 am Post subject:

15-50 Mobil-1 in the summer, 5-30 Mobil-1 in the winter. Your turbo will thank you.
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1980 924 Turbo

juno · Posted: Wed Jul 28, 2004 11:49 pm Post subject:

Thanks numbbers. I'm no mechanic, so thought I best ask! Just bought a tub 21.99GBP - about 40 USD i believe. Will be draining it very soon. Will I be okay just draining it without removing the filter?
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1980 924 Turbo RHD. 3" > 2.5" Stainless straight-through exhaust.

CMXXXI · Joined: 05 Nov 2002 Posts: 1939 Location: Vicksburg, MS

Always change the filter. Period.

If you don't, you'll leave about a liter/quart of old dirty oil in the system, in addition to having a dirty filter to start with. It's cheap insurance and good maintenance practice.
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'79 Eurospec 931

juno · Posted: Thu Jul 29, 2004 9:26 pm Post subject:

I would want to replace it when doing the oil normally, but it's only 2 days old.
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1980 924 Turbo RHD. 3" > 2.5" Stainless straight-through exhaust.

CMXXXI · Joined: 05 Nov 2002 Posts: 1939 Location: Vicksburg, MS

OK, I'm confused.

If I understand the thread, you want to change from dino oil to synthetic, and the engine has been run with the current dino oil and filter. What is 2 days old? The oil or the filter or both?

-IMO-

If the filter is 2 days old and the dino oil is 2 days old you should be able to get away with just draining the oil and leaving the filter. I don's see how anything would be bothered. A quart/liter of essentially clean dino oil in another 5 quarts/liters of synthetic isn't going to hurt anything. All you'd be doing is creating your own natural/synthetic blend.

If the filter is 2 days old and the dino oil is old, change the oil and filter. You don't want old oil (in the new filter) contaminating the new synthetic.

If the filter is old and the dino oil is 2 days old, change the oil and filter. The old filter is potentially full of contaminates and you don't want them in the new synthetic.
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'79 Eurospec 931

juno · Posted: Fri Jul 30, 2004 4:28 am Post subject:

Apologies if my posts have been a little unclear - I failed English at school

They're both 2 days old. The oil filter housing was removed when replacing the exhaust manifold gaskets. before I could speak to the bloke who did the work he'd filled it up with 10/40 part synthetic.

Thanks for the clear reply to my cryptic question. I'll be draining it off in my lunch break 2moro at work - made a bit of a mess on the driveway last time which my parents didn't really appreciate somehow

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1980 924 Turbo RHD. 3" > 2.5" Stainless straight-through exhaust.

Smoothie · Posted: Fri Jul 30, 2004 5:10 am Post subject:

I'd leave it as-is and switch to full synthetic at the next oil change.
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"..it's made in Germany. You know the Germans always make good stuff."

'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

juno · Posted: Fri Jul 30, 2004 6:03 am Post subject:

numbbers · Posted: Sat Jul 31, 2004 9:00 am Post subject:

Wait a minute, you couldn't have failed English, you are English. Now, I almost failed English, but I am an 'merican. So, what do you expect.

Anyway, I am with smoothie. The dino/syn blend will do you no harm for just one oil change. The reason for the mobil-1, is it resists coaking in the turbo better than dino, because it coaks at a higher temperature. But, you are not going to seriously coak your turbo bearings over just one oil change.
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1980 924 Turbo

Kenodog · Joined: 25 Jun 2003 Posts: 2651 Location: Vancouver,B.C.

21.99 Gbp!!!! Ouch that hurts.It's $22.99 Cdn here for Mobil 1 and I thought that was expensive.
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1979 Euro 931, Olive
1981 931, Sabine
1991 Ford Ranger XLT 4x4, Ricky
1996 Ford E-350 ex-FedEx Van
2014 Mazda CX-5 (Kinderwagon)
2019 KTM 790 Adventure
2024 KLX300
2024 KLX140

juno · Posted: Fri Aug 13, 2004 4:04 am Post subject:

Looks like I got it at a good price for overe here. It's £32.90 inc VAT here: http://www.boschserviceagents.co.uk/acatalog/Mobil_Synthetic_Oils.html
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1980 924 Turbo RHD. 3" > 2.5" Stainless straight-through exhaust.