Oil change, what viscosity do you use??
10-12-2012, 05:56 PM
#61
Race Car
A 15w-40 oil for the 928 in the winter is fine if ambient temps don't go over 70 deg F or so.
It's a pretty well-known fact that 928's with perfectly healthy and well operating engines idling in traffic with the A/C at full blast in 100 deg F ambient humid conditions will trigger the low oil-pressure warning light when using 5w-40 or 15w-40 oil, this is not just on my car. It's probably more common on the later models that have an external oil cooler that is under the radiator and not in the path of the engine cooling fans, so it gets no airflow when the car is not moving and heat radiating from the hot asphalt bakes it.
That Kendall 20w-50 oil looks pretty good, but to know for sure in a 928, yes you would need to do some UOA's. It does seem like the phosphorus content is a little low... zinc is just over 1000 ppm so that may be ok?
Dan
'91 928GT S/C
475hp/460lb.ft
It's a pretty well-known fact that 928's with perfectly healthy and well operating engines idling in traffic with the A/C at full blast in 100 deg F ambient humid conditions will trigger the low oil-pressure warning light when using 5w-40 or 15w-40 oil, this is not just on my car. It's probably more common on the later models that have an external oil cooler that is under the radiator and not in the path of the engine cooling fans, so it gets no airflow when the car is not moving and heat radiating from the hot asphalt bakes it.
That Kendall 20w-50 oil looks pretty good, but to know for sure in a 928, yes you would need to do some UOA's. It does seem like the phosphorus content is a little low... zinc is just over 1000 ppm so that may be ok?
Dan
'91 928GT S/C
475hp/460lb.ft
10-12-2012, 06:44 PM
#62
Rennlist Member
Audi Junkie - based on what you've presented and the graph details, isn't a 5w-40 the best selection? [excluding extreme condition use]
Thin for easy flow at cold, yet nearly equivalent to *w-50 hot.
Why do you select a 10w-40 then, if clearly the 10w-40 graphs indicate less coverage both cold and hot??
Thin for easy flow at cold, yet nearly equivalent to *w-50 hot.
Why do you select a 10w-40 then, if clearly the 10w-40 graphs indicate less coverage both cold and hot??
10-12-2012, 07:30 PM
#63
Nordschleife Master
Audi Junkie - Which Porsche are you putting that oil into?
You appear to be a regular poster in flat-6 forums - I suspect you jumped in here to discuss oil without thinking about which engine this forum has, or reading the owners manual for these cars?
I think Sendarius summed it up pretty well:
You appear to be a regular poster in flat-6 forums - I suspect you jumped in here to discuss oil without thinking about which engine this forum has, or reading the owners manual for these cars?
I think Sendarius summed it up pretty well:
10-13-2012, 02:19 AM
#64
I did forget to mention that 15w-40 has an HT/HS of 4.3cP, a bit more than people expect, considering 5w-40 PCMOs are just 3.5cP. I guess this is the kind of info I should be featuring.
http://www.mobil.com/USA-English/Lub...300_Super.aspx
The 10w-30 Mobil Delvac 1300S has HT/HS of 3.6cP, fwiw. Most people look to a 5w-40 for that number.
http://www.mobil.com/USA-English/Lub...300_Super.aspx
The 10w-30 Mobil Delvac 1300S has HT/HS of 3.6cP, fwiw. Most people look to a 5w-40 for that number.
10-13-2012, 02:29 AM
#65
I did forget to mention that 15w-40 has an HT/HS of 4.3cP, a bit more than people expect, considering 5w-40 PCMOs are just 3.5cP. I guess this is the kind of info I should be featuring.
http://www.mobil.com/USA-English/Lub...300_Super.aspx
The 10w-30 Mobil Delvac 1300S has HT/HS of 3.6cP, fwiw. Most people look to a 5w-40 for that number.
http://www.mobil.com/USA-English/Lub...300_Super.aspx
The 10w-30 Mobil Delvac 1300S has HT/HS of 3.6cP, fwiw. Most people look to a 5w-40 for that number.
What is your hot oil pressure using what you are using.
I can tell you from a bit of experience, here in Texas, you are a damned fool if you run anything less than 15w-50 in our motors. Not talking the latest boxer engines from Porsche, we are talking the 4.5l/4.7l/5.0l and the 5/4l v8's.
10-13-2012, 01:48 PM
#66
God forbid that you travel outside Texas.
Got any UOAs to support your assertions?
I tell you what, I'll grab some cans of 10w-50 Shell Fire & Ice with API SH/SG from my Father-in-Laws basement, and you can run that, feeling completely smug about your choice.
Why not? Early '80s vintage, it's the oil your engine was intended to run on. Running anything else would be MADNESS!! It has TONS of zink, and is plenty thick...until the engine churns it into a thin soup of Group 1 base oil and a sludge of ancient polymeric viscosity index improvers. I'll set everything up, inc a UOA for afterwards....deal?
Got any UOAs to support your assertions?
I tell you what, I'll grab some cans of 10w-50 Shell Fire & Ice with API SH/SG from my Father-in-Laws basement, and you can run that, feeling completely smug about your choice.
Why not? Early '80s vintage, it's the oil your engine was intended to run on. Running anything else would be MADNESS!! It has TONS of zink, and is plenty thick...until the engine churns it into a thin soup of Group 1 base oil and a sludge of ancient polymeric viscosity index improvers. I'll set everything up, inc a UOA for afterwards....deal?
10-13-2012, 06:21 PM
#67
Nordschleife Master
So you've been pimping the Mobil "High Miles" Oil on three forums (993,996,928) other than your Boxster's? Amusingly, they span three very different engines, and almost 30 years of production and engine technology.
Its good you're taking an interest in the Porsche community in general's oil requirements - but you should at least take the time to go compare the owners manuals for each of those model/engine variants and see what Porsche recommended at production time for those engines.
The owners manual for my Porsches clearly states that 10W40 is not suitable for my climate, and that is supported by empirical evidence locally. Making sweeping generalisations in a forum like this is pointless.. unless you're just here to troll? hmmm...
Your first post bumped a 3 year old thread with:
So you've evidently been someone who's bumped heads with Doug Hillary elsewhere, and presumably have an axe to grind on the oil front (I'm not saying Doug was ever right.. just that I'm bored with oil arguments). That, coupled with the insults to various members on this forum, makes troll ever more likely.
Its good you're taking an interest in the Porsche community in general's oil requirements - but you should at least take the time to go compare the owners manuals for each of those model/engine variants and see what Porsche recommended at production time for those engines.
The owners manual for my Porsches clearly states that 10W40 is not suitable for my climate, and that is supported by empirical evidence locally. Making sweeping generalisations in a forum like this is pointless.. unless you're just here to troll? hmmm...
Your first post bumped a 3 year old thread with:
So you've evidently been someone who's bumped heads with Doug Hillary elsewhere, and presumably have an axe to grind on the oil front (I'm not saying Doug was ever right.. just that I'm bored with oil arguments). That, coupled with the insults to various members on this forum, makes troll ever more likely.
10-13-2012, 08:32 PM
#68
Why don't you post a copy of the manual?
Seems like an obvious thing to do.
YOUR ENGINE, YOUR MANUAL...blah blah. I guess the 1980 Porsche engineers were supposed to time travel into the future to discover what tribology tech will come decades later, and write it preemptively into the recommendations. lol, that's some funny stuff.
Seems like an obvious thing to do.
YOUR ENGINE, YOUR MANUAL...blah blah. I guess the 1980 Porsche engineers were supposed to time travel into the future to discover what tribology tech will come decades later, and write it preemptively into the recommendations. lol, that's some funny stuff.
10-13-2012, 09:06 PM
#70
MY 2010 turbo VW manual calls for 5w-40 exclusively, plus it's flashed to 300ft-lbs.
otc Edge 5w-30 seems to have done an outstanding job. A whisker from a 20 weight, but lower wear than Motul 5w-40 UOAs I've seen. I guess the VAG time machine went past it's service mark.
I guess "Porsche Approval" only means SOME Porsches.
Wait.
"The Porsche A40 standard requires extreme high shear resistance from the lubricant. This specification applies to ALL PORSCHE engines, except Cayenne V6 and Diesel versions (for these specific engines, use an approved Porsche C30 lubricant such as MOTUL 8100 X-clean+ 5W-30).
Opie is always a fun place to kick it...
http://www.opieoils.co.uk/c-680-car-...ification.aspx
http://www.opieoils.co.uk/c-647-engi...viscosity.aspx
otc Edge 5w-30 seems to have done an outstanding job. A whisker from a 20 weight, but lower wear than Motul 5w-40 UOAs I've seen. I guess the VAG time machine went past it's service mark.
I guess "Porsche Approval" only means SOME Porsches.
Wait.
"The Porsche A40 standard requires extreme high shear resistance from the lubricant. This specification applies to ALL PORSCHE engines, except Cayenne V6 and Diesel versions (for these specific engines, use an approved Porsche C30 lubricant such as MOTUL 8100 X-clean+ 5W-30).
Opie is always a fun place to kick it...
http://www.opieoils.co.uk/c-680-car-...ification.aspx
http://www.opieoils.co.uk/c-647-engi...viscosity.aspx
10-13-2012, 09:11 PM
#71
God forbid that you travel outside Texas.
Got any UOAs to support your assertions?
I tell you what, I'll grab some cans of 10w-50 Shell Fire & Ice with API SH/SG from my Father-in-Laws basement, and you can run that, feeling completely smug about your choice.
Why not? Early '80s vintage, it's the oil your engine was intended to run on. Running anything else would be MADNESS!! It has TONS of zink, and is plenty thick...until the engine churns it into a thin soup of Group 1 base oil and a sludge of ancient polymeric viscosity index improvers. I'll set everything up, inc a UOA for afterwards....deal?
Got any UOAs to support your assertions?
I tell you what, I'll grab some cans of 10w-50 Shell Fire & Ice with API SH/SG from my Father-in-Laws basement, and you can run that, feeling completely smug about your choice.
Why not? Early '80s vintage, it's the oil your engine was intended to run on. Running anything else would be MADNESS!! It has TONS of zink, and is plenty thick...until the engine churns it into a thin soup of Group 1 base oil and a sludge of ancient polymeric viscosity index improvers. I'll set everything up, inc a UOA for afterwards....deal?
10-13-2012, 11:38 PM
#73
benefit, or the troll who is long since out of ideas.
Please, continue posting, but on-subject and without emotion.
10-14-2012, 12:23 AM
#74
Drifting
Well having a good quality oil that does what it is required to protect the engine is important.
Oil has to be able to handle the stress and the heat and still have good shier ability.
I want my engine to have the best because if I have a catastrophic failure,
I will no longer have the original 89 euro that I bought, and that is important to me.
So I spend the bucks on Amsoil $13 a Litre x 10.5 litres + a filter $150 every 5000 kilometers.
Oil has to be able to handle the stress and the heat and still have good shier ability.
I want my engine to have the best because if I have a catastrophic failure,
I will no longer have the original 89 euro that I bought, and that is important to me.
So I spend the bucks on Amsoil $13 a Litre x 10.5 litres + a filter $150 every 5000 kilometers.
