20W50 too heavy?
#16
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#17
My 951 ran fine on 15W-50. I am not sure why the 924S didn't like it. After reading the Panorama article I am going to move all my cars to 0W-40. (BMW dealer made the same recommendation for my 740il)
#18
Originally Posted by seattle951
My 924S runs terrible on Mobil 1 15W-50. I tried it once and immediately moved to Mobil 1 0W-40. On the heavier oil the car had lots of lifter noise on start-up and the oil warning light would be on for 30 seconds after startup. Oil pressure would go to 5 and never drop even at idle. The car also felt sluggish. With 0W-40 the car purrs like kitten.
You might also want to check this month's Porsche Panorama magazine. They discuss oil and recommend that all Porsches made after 1973 should run 0w-40 synthetic. The primary driver for this was the amount of time it takes the oil to circulate when cold at startup. They claim that the heavier oils can take up to 45 seconds to circulate causing excessive wear. With the 0w they claim the time drops to seconds.
You might also want to check this month's Porsche Panorama magazine. They discuss oil and recommend that all Porsches made after 1973 should run 0w-40 synthetic. The primary driver for this was the amount of time it takes the oil to circulate when cold at startup. They claim that the heavier oils can take up to 45 seconds to circulate causing excessive wear. With the 0w they claim the time drops to seconds.
Thin oil works better then it used to, but for track use and longevity under those conditions, a thicker oil (opinion) is required. Using 0-40 in a 100k miles 944 engine does not sound like a good idea.
#19
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Originally Posted by BrendanC
Thin oil works better then it used to, but for track use and longevity under those conditions, a thicker oil (opinion) is required. Using 0-40 in a 100k miles 944 engine does not sound like a good idea.
yeah, i was thinking if it takes that long for pressure to build and oil to reach the lifters, and he's getting bad running with heavy oil, there's a problem with the motor.
i think now that summer's here, i'm going to go to 15-50........just have to find a good one first.......damn you mobil 1.........
#22
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The S2 is good with 20w50. These cars also tend to have more lifter noise than the 8 valve cars, even with brand new lifters (I know). Don't forget that you are also hearing all 4 of the injectors firing at the same time, all the time, so that also tends to add to the noise level in that engine bay.
It's fine, they all do that.
Dal.
It's fine, they all do that.
Dal.
#24
I switched the 951 to Mobil 1 0w-40 from 15W-50 during the last oil change. The 951 is heavily modified and is 80% for DE days and will later be for more serious track. It has an upgraded oil system including an additional oil cooler. Since the temperatures are very moderate in Seattle, I was planning on staying on 0W-40 and changing the oil often. Both the 924S and 951 run very cool. They rarely cross the quarter mark on the temperature gauge even in stop and go traffic.
#25
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Originally Posted by schnellfahrer
I've been running 5w50 in my 951. Works just fine. Burns very little oil.
I'm changing to 50 (single grade) next week.
I'm changing to 50 (single grade) next week.
#27
Burning Brakes
Redline 50 weight has the same ability to change viscosity as their 20w50. However, they don't recommend it for street use as it doesn't have all the anti-sludge additives and the like, so it will tend to clog things up unless you get it up to temp and keep it there - say like tracking the car. ;-)
Amsoil and the other "straight weight" oils will be similar.
Amsoil and the other "straight weight" oils will be similar.
#28
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Originally Posted by White Pony
wouldn't that be be like 50w-50?
This is what I'm trying out (8450).
http://www.le-inc.com/products/Eo/EO_HeavyDuty.html
#29
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I run my 1990 S2 on 10W-40 Castrol Magnatec (Syntec in the states). Runs fine. It has been on 10W-40 Mobil for the last 10 years. No lifter noise at all - but they have only been in for 14,000km (8,700 miles).
When I bought the car I asked the local dealer their recommendation about oil as I planned on using 5W-40 (I usually keep a good stock of it for my two Saab 9-5's and I figured I standardise all cars on the same oil). Their advice was "don't do it". Too thin for a Porsche of that age, especially one with a few miles (151,000km / 93,830 miles).
Yes, Porsche currently recommend 0W-40 Mobil 1, but the real reason is probably that since it is the factory fill oil these days, they will recommend it accross the board. A thin oil is fine if you live in very cold territory, or you have a new (or turbo) motor, but I definitely would not recommend it for an older car.
Talk to your local OPC or whoever does the work for you and see what they recommend - chances are it will be at least a 10W oil.
When I bought the car I asked the local dealer their recommendation about oil as I planned on using 5W-40 (I usually keep a good stock of it for my two Saab 9-5's and I figured I standardise all cars on the same oil). Their advice was "don't do it". Too thin for a Porsche of that age, especially one with a few miles (151,000km / 93,830 miles).
Yes, Porsche currently recommend 0W-40 Mobil 1, but the real reason is probably that since it is the factory fill oil these days, they will recommend it accross the board. A thin oil is fine if you live in very cold territory, or you have a new (or turbo) motor, but I definitely would not recommend it for an older car.
Talk to your local OPC or whoever does the work for you and see what they recommend - chances are it will be at least a 10W oil.