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Motor/Tranny Oils?

 
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isuras2  



Joined: 17 Jun 2005
Posts: 458
Location: Phoenix, AZ

PostPosted: Thu Jun 30, 2005 10:43 pm    Post subject: Motor/Tranny Oils? Reply with quote

What motor oil do you all use? I was thinking that 10W30 is fine (Haynes), but read somewhere that 20W50 is what should be used. 80W90 for transmission?
Thanks,
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'80 931 (sold)
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John Brown  



Joined: 07 Nov 2002
Posts: 903
Location: Leesburg VA

PostPosted: Thu Jun 30, 2005 11:02 pm    Post subject: Reply with quote

Most of us, me included, probably err on the side of an oil that is too 'heavy'. Partly a trickle down from those of us running on tracks and 'if it's good for them it's good for me'. Wrong.

Especially with the improvements in oils since 1982, I would suggest that if your pressure is reasonable 10W30 is fine. The 15W50 synthetics also are OK if you want to anti up the cost. If we were running a 924 on the street I would be using 10W30 or 10W40 plain or blended.

I use straight 50, but that is on a track, we ALWAYS have time to warm the car, and I put 10W30 in for the off (cold) season.
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80 931 - #931 44Cup
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isuras2  



Joined: 17 Jun 2005
Posts: 458
Location: Phoenix, AZ

PostPosted: Fri Jul 01, 2005 12:03 am    Post subject: Reply with quote

So if I want to buy one oil to use year-round, 10W30 would be the one?
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'80 931 (sold)
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Former Omaha Crew
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Diesel  



Joined: 03 Nov 2002
Posts: 1061
Location: Ellington,CT

PostPosted: Fri Jul 01, 2005 1:54 am    Post subject: Reply with quote

What does it say in the owner's manual? That's what I always rely on.
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isuras2  



Joined: 17 Jun 2005
Posts: 458
Location: Phoenix, AZ

PostPosted: Fri Jul 01, 2005 2:28 am    Post subject: Reply with quote

I don't have an owners manual, but Haynes says:
Summer SAE 30W
Winter SAE 20W
Tranny SAE80

I assume that SAE 30W = 10W30 and SAE80 = 80W90?
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Rob
'80 931 (sold)
'80 924 NA (sold)
Former Omaha Crew
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Raceboy  



Joined: 01 Mar 2004
Posts: 2326
Location: Estonia, Europe

PostPosted: Fri Jul 01, 2005 2:59 am    Post subject: Reply with quote

Hey guys, it depends of the shape of the engine too. And one more little thing: time has passed and so has technology. You don't have to use fully synthetic oil but 10W-40 semisynth is the best choice for the non-rebuilt 924 NA engine, already tried many of them.
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Paul  



Joined: 02 Nov 2002
Posts: 9491
Location: Southeast Wisconsin

PostPosted: Fri Jul 01, 2005 4:27 am    Post subject: Reply with quote

Porsche's latest recommendation is that all Porsches ever made should use 0W-40 Mobil 1.
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John Brown  



Joined: 07 Nov 2002
Posts: 903
Location: Leesburg VA

PostPosted: Fri Jul 01, 2005 12:35 pm    Post subject: Reply with quote

Diesel wrote:
What does it say in the owner's manual? That's what I always rely on.


Dan's correct, as always. Found the OM for the 80 and factory spec is 10W40 or 15W50 or 20W50. With the 15W50 having no upper or lower temp limits. I stand corrected!

Still, tempering the OM info with Paul's information about the factories updated guidance which takes into account the changing lubricant technology; I think I might gravitate back to the 10W40 again!!!

Ah!! Too many choices. Just put something slippery in.
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80 931 - #931 44Cup
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maireeka  



Joined: 29 Aug 2004
Posts: 299
Location: North Alabama

PostPosted: Fri Jul 01, 2005 1:40 pm    Post subject: Reply with quote

I use 20w50, but my car's fairly leaky and I've had a couple of problems with low pressure when the engine's a bit on the hot side.
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numbbers  



Joined: 05 Nov 2002
Posts: 1910
Location: Highlands Ranch, Colorado

PostPosted: Sat Jul 02, 2005 10:39 am    Post subject: Reply with quote

Well, all of the regulars no where I stand. Mobil-1, Mobil-1, Mobil-1. I run 15W-50 in the turbo, and the same in my other cars in the summer. In the winter, I run 5W-30. I would try the 0W-40, but I have never found it in a store.
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Smoothie  



Joined: 01 Jan 2003
Posts: 8032
Location: DE (the one near MD, PA, NJ)

PostPosted: Sat Jul 02, 2005 1:08 pm    Post subject: Reply with quote

How about Mobil 1 EP? 15,000 mile oil change interval?
http://www.mobiloil.com/USA-English/MotorOil/Oils/Mobil_1_Extended_Performance_FAQs.aspx#FAQs1
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Paul  



Joined: 02 Nov 2002
Posts: 9491
Location: Southeast Wisconsin

PostPosted: Tue Jul 05, 2005 5:22 am    Post subject: Reply with quote

My 2001 986 has 46,000 miles and it's oil has been changed 4 times. the oil level has never left the full mark between changes and the oil is almost clean after a year of use.

Porsche recommends that it's oil be changed every 15,000 miles or once a year unless the car is driven at least 9,500 miles a year, then it can wait until 15,000 miles. They also recommend that the oil filter be changed every other oil change!
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isuras2  



Joined: 17 Jun 2005
Posts: 458
Location: Phoenix, AZ

PostPosted: Wed Jul 06, 2005 7:49 am    Post subject: Reply with quote

I got some regular Quakerstate 10W-30 that I will use. I will see how that works and will go from there.
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'80 931 (sold)
'80 924 NA (sold)
Former Omaha Crew
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CBass  



Joined: 03 Nov 2002
Posts: 2807
Location: Vancouver, Canada

PostPosted: Mon Jul 11, 2005 7:08 am    Post subject: Reply with quote

I run Castrol GTX 10W40 in my 924 and my GTI, as well as in my parents Passat 2.0 16v.

The best oil depends on climate, where I live it never really gets below 25f/-5C, and rarely above 100f/30C. Hence I don't need to run 10W30 or 20W50, etc. If you live in a climate where it gets really cold, or really hot, you'll want a lighter weight or heavier weight oil, accordingly. Synthetics work better than conventional oils in extreme temperature conditions.

If I were to own a 931, I would run synthetic because the turbocharger is oil cooled, and that puts a lot of stress on the oil.
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