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OIL READINGS

davidcross

davidcross

New member
i know i have posted this before but i STILL keep getting deiiefernt reading when i do the oil check. When is the best time to do an oil reading? Also any idea why sometimes it takes only 6 seconds to give me an oil reading amnd then others it tells me 25 minutes?? Im confused to say the least
 
David,

As long as you are doing you oil level check on level ground, the dashboard readings should be close at all times (unless you are using oil). The reason that sometimes you have to wait 25mins instead of 6secs is that you have probably just returned from a run. You need to wait around 30mins after a run to do an oil level check, this is to ensure all oil has returned from the higher parts of the engine into the sump.

Be very careful NOT to overfill. The amount of oil between graduations is not very much (see other threads elsewhere) so if you add oil only add a small amount at a time.

Paul
 
Not sure about 997, I have a 993 RS assume the principles are the same.

With about a large amount (15 ltres) of oil in the dry sump system in a 993, it takes a good run (20 minutes) to warm up. This expands the oil, raising the level in the reservoir, and makes it less viscous so this is the best time to check oil level as it all stabilises more quickly. After 20 minutes - let the engine tick over for 20 seconds (eg at a red light) and read off the level gauge which should be about half way between max and min (or a bit higher if very hot). If it lies close to the red minimum - it will take about a litre of oil (but as this is 1 litre in about 15 in a dry sump system I dont need to worry about this being dangerously low). If you read the oil level gauge when the oil is cold (say after a minute from cold start and ticking over) you may see a lower level on your gauge - so dont top up with oil at this stage as it may be overfull when at its normal hot running temperature. The dip stick is quite tricky to read as it smears with oil, so I rely on the level gauge.

On oil pressure, I run Mobil 1 at about 4.5 bar hot, and hot tickover at about 2,5 bar although I understand it can go as low as 1 bar on tickover without worry.

Interested to know if 996 / 997 work differently (I presume they have less oil?).
 
tks guys. Sequence of events was run car from cold for fifteen minutes, leave for an hour then returned and turned key and had oil level on last level flashing at me. I then drove 15 mins home again
and done a check that showed it 2 thirds full. I then put half a litre of mobil 1 in and checked it shortly after and it sat on three quarters full. Will check it again tonight
 
Sounds to me like you are checking the level too cold. Let it really warm up and THEN check without standing to cool off.
 
Hear you but its clearly a grey area as the man just before u on this post suggests checking it cold wen it had settled back down. I wonder what an opc wud recommend! Its an interesting one
 
A dry sump system is not like an traditional wet sump where you let oil "settle down" in the sump before you use a dip stick to measure the sump level. I have have another car with dry sump, and I always check oil level in the reservoir dynamically while engine is running warm or immediately after switching off (warm) before the oil slowly seeps out of the reservoir (where it is measured) and back into the sump (where it is not measured). My Cosworth engine oil tank level will rise 3 inches when warmed up after standing, and if topped up cold can blow excess oil out of the overflow when warm.

Maybe a 997 is different and is calibrated for cold level measurement?


 
My experience appears to differ from yours in that I rarely notice any change in reading from warm to cold engine state and I check reading before starting and if I remember about 30 minutes after returning the car to the garage. Perhaps there is more variation when the oil level is near the lower end, I try to ensure the gauge never falls under one bar below full, when it drops to two bars I add 0.4 litre. Current consumption is somewhere between 3000 and 4000 miles/litre.
 
Just asked opc colchester who said I should check the oil when the engine is at full operating temperature but 2 read the manual 2 check this! Manual states either when engine is cold or hot so that the temperature check lasts no longer than 5 minutes. Man I'm confused! Cheers for all the help
 
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