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oil for older engines

O

oxford_hippo

PCGB Member
Member
hi,

just noticed ( or rather bombarded by halfords sales e mails ) they have fully-synthetic magnatec for £17.50 for 4 ltrs,

is 5w 30 a1 potentially too 'thin' for a higher mileage ( 127k ) 1994 engine?


maurice - suspect there may be something on this in the tech articles - though bit baffled by some of thew science so hoped a 'quick' query here might answer the problem.

many thanks
T[&:]
 
Hi

There was a comprehensive set of articles on oil on the 964 site quite recently, have a look, I'm sure you'll find it. From memory 10/40 was the way to go. The articles were quite detailed but easy enough to follow and i was suprised at just how wrong you can go with the wrong grade.

Ian
 
My 1995 Carrera 4 (71,00 miles) was recently serviced by a friend with his own garage and years of experience with air-colled Porsches, he recommends semi-synthetic (Mobil) 10W 40 (semi is apparently kinder to gaskets and seals etc). I used 0W 40 prior to this with the usual gurgling on cold morning starts, this has all stopped as well now, deep joy.
 
Thanks for the reply Maurice.
As you rightly say all Porsches are FActory filled with 0W-40 as of Jan 24th 2001, this does not however mean that older cars were or should be.
I have spoken to my mechanic and he has sent me a pdf copy of Porsche technical Bulletin 0301 for vehicles from 1973 to 1998 including 993's.
Page 4 specifies Exxon Mobil 10W-40 pnp GL WW as fully approved. (pnp being Porsche speak for semi-synthetic, (ncp being fully synthetic) GL being non seasonal (G being seasonal) and WW meaning that this oil is suitable for, and available worldwide.
Porsche themselves specify that the only real advantage of the 5W and 0W oils is that their viscosity is maintained at lower temperature ranges (-25 deg C for 5W, not sure about 0W, but their upper ranges are all similar. 10W-40's lower range is around -20 deg C.
As you say each to their own, I am happy to listen to my mechanic who has 30+ years experience with Porsche cars and owns several (all air cooled (sorry air and oil cooled)), I will carry on with the 10W-40 and if my lifters stop pumping you will be the first to know.
 
Steve,
Saw your comment about gurgling during warm up - from my experience this is not caused by the type of oil, but by it's level. The gurgle always goes away when serviced because the oil is back up at top of dip-stick. Let it get down to 2/3rds or so and the characteristic returns!

BTW - Are you the Steve Talbot who once owned my car? Black 993C4 - there is a Steve Talbot on the list of previous owners, Bristol area, owned it for a couple of years from 2004?
 
Hi Mark, afraid not, bought my car just over 2 years ago (Arena Red) and I'm not aware of any other name-sakes in Bristol, sorry, would've been nice though wouldn't it.
Not sure about the level theory, but wouldn't argue, I have never had any issues with gurgling other than when using 0W-40. Started shortly after that oil change and to be honest it scared me to death, couldn't work out what the hell it was until a friend told me it was the oil moving around in the sill pipes prior to the oil thermostat opening up. Changed back to 10W-40 and no problems. I have also googled it and it seems to be a common-ish problem. Best regards Steve
 
I just bought 12 litres of Magnatec 10w40 from Eurocarparts for £44. Use the code mm30 for a 30% discount
 

ORIGINAL: MoC2S

Well, each to his or her own, but ... ;)

The factory actually test the oils that get on the approved list. 993s were the only Porsche air cooled engines to have hydraulic valve actuation, and it was for exactly this reason that the oil spec was changed, and the factory fill was M1 0-40 ..

So don't come over with shock and horror when your lifters won't pump up, and your engine makes a noise like a jack-hammer on heat !

Happy days, cheers, Maurice
Click to expand...

Just to clarify, the factory fill for the 993 was never a 0W40.

Perhaps a glance at the Driver's Manual would help you out Maurice?
 
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