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isuras2 · Joined: 17 Jun 2005 Posts: 458 Location: Phoenix, AZ

Question for the oil guys out there:

If I wanted to change a car from an owners' manual recommended 5W-20 synthetic blend to a fully synthetic 5W-20, would that be a problem?

Thanks,
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Rob
'80 931 (sold)
'80 924 NA (sold)
Former Omaha Crew

Neil924 · Joined: 18 Mar 2003 Posts: 4225 Location: Canada

On older engines the thinner syn oils can cause leaks.

isuras2 · Joined: 17 Jun 2005 Posts: 458 Location: Phoenix, AZ

I guess I am asking because I have a 2003 Ford Windstar minivan. I wouldn't think of putting synthetic in my 924 until I rebuild the engine...way in the future!
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Rob
'80 931 (sold)
'80 924 NA (sold)
Former Omaha Crew

dpw928 · Joined: 02 Nov 2002 Posts: 1860 Location: owasso, ok 74055

Synthetics have a high detergent content which will remove any sludge that has formed around main and cam seals. If the seals are old you will probably see leakage after switching to synthetics.

Dennis
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81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black

John Brown · Joined: 07 Nov 2002 Posts: 903 Location: Leesburg VA

MunkPuppy · Posted: Fri Jun 23, 2006 3:01 pm Post subject:

I'm 100% for going to syn oil! If possible, do an engine flush before you drain the old oil out, it will help flush out some of the sludge to make your first syn oil change a little less "contaminated" by the old oil and sludge.
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'80 931 FOR SALE

"It's a shame that stupidity isn't painful"
-Anton Szandor LaVey

N-Dub · Posted: Fri Jun 23, 2006 3:27 pm Post subject:

Royal Purple all the way!!
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'79 924 now Totaled! Carrera GT bodywork for sale!
'87 951

Kenodog · Joined: 25 Jun 2003 Posts: 2669 Location: Vancouver,B.C.

Mobil 1 5-50W,good stuff.
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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

timstar92404 · Joined: 22 Sep 2004 Posts: 2075 Location: richmond BC

I was thinking of using synthetic in my 944 but it's high milliage so I don't think it's a good idea even though there is no oil leaking right now.

otherwise in a new engine synthetic is a good idea plus you will have to do less oil changes so it isn't that much more expensive. I would think if synthetic blend doesn't cause any leaks in your engine full sythetic wouldn't leak also. At least it sounds logical I've never tried it.
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78 924 sold.
85.5 944

Rooy · Joined: 16 Jul 2005 Posts: 41 Location: Neenah, WI

koolkarateguy · Posted: Sat Jun 24, 2006 11:46 am Post subject:

I'll be the guinea pig. I put 5W50 synthetic in my '79 924 last weekend . It was running 20W50 I think. Anyway, I'll let ya'll know how it goes. So far no leaks or oil consumption, but I just did a 120 mile round trip high speed run tonight so I'll check the oil level and look for leaks tomorrow ....but so far no drips and the engine feels nice and tight soooooo...I guess we'll see !!

koolkarateguy · Posted: Tue Jul 11, 2006 11:12 am Post subject:

Over 2 weeks later and still no leaks...engine is still tight. Not burning or losing any oil.

Khal · Posted: Tue Jul 11, 2006 12:00 pm Post subject:

I read somewhere recently (the PCA newsletter?) that Porsche recommends 0W-40 Mobil 1 for all models, regardless of age...
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'80 924 Turbo