I've been paying attention to my Oil pressure gauge and I noticed that oil pressure is higher after oil changes.. so.. i think a good way besides the milage to see when you need an oil change is to see if you start seeing an overall pressure drop..

for reference, besides dirt, oil needs to be changed as viscosity breaks down.. so i was wondering if theres a relation with oil pressure and viscosity.

 

I bunch of years back I had a 76 Ford LTD (351cid) and I hooked up a mechanical oil pressure and oil temp gauge. I knew just by looking at the psi when it was time to change the oil and it totally concurred with the mileage of 3000.

Did I answer your question?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bbasso &raquo;</TD></TR><TR><TD CLASS="quote">I bunch of years back I had a 76 Ford LTD (351cid) and I hooked up a mechanical oil pressure and oil temp gauge. I knew just by looking at the psi when it was time to change the oil and it totally concurred with the mileage of 3000.

Did I answer your question? </TD></TR></TABLE>

i see.. i guess thats one good benefit of oil pressure gauge.

 

awesome observation... good post

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hybrid ctr &raquo;</TD></TR><TR><TD CLASS="quote">awesome observation... good post </TD></TR></TABLE>

dont have an answer for you there. you would probably get better responses if you asked that same question here: http://theoildrop.server101.com/ubb/ultimatebb.php

 

I have noticed the same thing for quite some time as well....as stated above good observation!!!

 

Oil viscosity relation to oil pressure

they are directly related

 

looks like i need an oil pressure guage then.

but yah, good info.

i think all cars should burn small oil, then, no need for oil changes, just add a quart once in a while.

 

&lt;== will be installing new Greddy Oil pressure and temp gauges for this exact reason this weekend hopefully... look for a thread when I'm finished.

 

How much did that Greddy setup cost you? Definitely something I've been looking into...

 

Total costs so far:
(prices include shipping)

Greddy Oil Pressure & Temp Gauges from MVP motorsports = $263.31
(52 mm electronic, black faced)

Autometer Gauge Bezel from SummittRacing.com = $78.40

Greddy Oil Block Adapter from Importparts.com = $68.46
(goes between oil filter and block - allows you to screw sending units right in and not run any additionnal T's or lines - simpler is better...)

Total = $410.17

I'm waiting on the block adapter - hopefully it will arrive sometime this week, and I can install the gauges this weekend.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bbasso &raquo;</TD></TR><TR><TD CLASS="quote">I bunch of years back I had a 76 Ford LTD (351cid) and I hooked up a mechanical oil pressure and oil temp gauge. I knew just by looking at the psi when it was time to change the oil and it totally concurred with the mileage of 3000.</TD></TR></TABLE>

Thats how I know when to change the oil in the stang. When it burns more that 2 quarts, the oil pressure needle will drop way down when I brake hard.
I've recently started using 20w50 in it to keep it from burning so much oil, and I do notice the oil pressure is higher.

I think changing every 3,000 is the best practice though.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Philly_NBP_R &raquo;</TD></TR><TR><TD CLASS="quote">&lt;== will be installing new Greddy Oil pressure and temp gauges for this exact reason this weekend hopefully... look for a thread when I'm finished.
</TD></TR></TABLE>

150°C is not enough !! The temp can go higher easily.

 

oh crap...
I guess I'll just put em in and see (might have to turn it into a water temp gauge)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ITR5874 &raquo;</TD></TR><TR><TD CLASS="quote">

150°C is not enough !! The temp can go higher easily.

</TD></TR></TABLE>

thats 302 degrees F. i hope you wont be using a 30 wt. at this temperature.

also, some motor oils are more volatile than others. click on the link below and scroll down to the charts posted and thatll give you an idea of how some oils burn off easier than others. theres also a good discussion inside there.

http://forums.vwvortex.com/zer...age=4

 

so does anybody have any idea what the common oil temperature and pressure range is for our cars (high / low / average)?

 

your gauge would should show no lower than .7kg/cm2 after it warms up at idle.. and no lower than 3.5kg/cm2 at 3000rpm.. and i think arond 5kg/cm2 at 4000rpm and a bit higher at higher rpms.. shouldn exceed 5 and 3/4kg/cm2.. that reading very much depend on the type of oil.. but .7 minumum at idle

i usually try not to push the car until it drops near that .7.. and that don't happen until i drive for some time after already warming up the car.

 

good info... what about oil temps?

 

i'm not sure about that one since i don't run one.. i'm guessing it would kinda be related to oil pressure.. like overall you'll probably have lower oil pressure as it warms up and therefore higher temps..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vtec.dc2 &raquo;</TD></TR><TR><TD CLASS="quote">i'm not sure about that one since i don't run one.. i'm guessing it would kinda be related to oil pressure.. like overall you'll probably have lower oil pressure as it warms up and therefore higher temps..</TD></TR></TABLE>

just the oppsite I had higher pressure when cold and lower while warm

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bbasso &raquo;</TD></TR><TR><TD CLASS="quote">just the oppsite I had higher pressure when col and lower while warm</TD></TR></TABLE>

Yep. My mustang will go close to 100psi when cold if I rev it up too much.
About 25psi more than it does when warm.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bbasso &raquo;</TD></TR><TR><TD CLASS="quote">

just the oppsite I had higher pressure when cold and lower while warm</TD></TR></TABLE>

yep.. higher pressure at startup and lower after warms up

 

so does anybody have any idea what the common oil temperature and pressure range is for our cars (high / low / average

220-240F (stump) is what I normally saw in my B18C5 [with heater ON]

 

great info - thanks guys

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ejprimo &raquo;</TD></TR><TR><TD CLASS="quote">

thats 302 degrees F. i hope you wont be using a 30 wt. at this temperature.

also, some motor oils are more volatile than others. click on the link below and scroll down to the charts posted and thatll give you an idea of how some oils burn off easier than others. theres also a good discussion inside there.
</TD></TR></TABLE>

This picture is taken from a friends stock ITR on 14th of July 2003 during a track day in Hockenheim . The ITR was already equipped with a 19row oilcooler. Because of the high temps we use 10W60 Castrol RS Racing Synthec for trackdays. The 0W40 and 5W40 oil ruined some or our b18c6 before. It was burnt down to a dangerous low amount during the period of 10 laps.. The 10W60 stands this temp because of it`s high viscosity.



A stock ITR without a seperated oil cooling system can easily push up the oil temp to more than 160°C. Just experience.