Where did my oil go???!!!!

[airhead04]

I was driving my car today and the highest my oil went was around 25lbs. It use to sit at about 35lbs. Something is wrong. Ive been losing oil little by little but Im no where near empty, Ive still got plenty of oil. Iwas told to get a bigger oil pump because the pistons are larger due to it being bored 40 over. Do I need a new pump, its been runnig fine up until today. It still runs damn good but, Im a little worried that with the lower pressure I may damage my engine.

Any advice would be MUCHLY appreciated.

Thats the link to the video of the gauges:

http://www.youtube.com/watch?v=6dIJ60rDSRA

 

[88t]

What weight of oil? any noticable change in power? any leaks? any smoke coming from exhaust?

they say 10lbs per 1000 rpm.

 

[gaboonviper85]

Pistons have ZERO relation too oil pressure!

When you say "sits at 35 psi" at what rpm? What rpm are you seeing 25psi? What psi do you see at 3000rpm? What oil are you using? What oil filter are you using? When was your last oil change? What's your oil pressure at idle?

Oil pressure has too do with bearings and engine rpm only....unless you have an oil leak so bad that it's shooting oil out but you'd have blown the motor by now.....we need all these questions answered or else helping you is impossible!

 

[gaboonviper85]

What weight of oil? any noticable change in power? any leaks? any smoke coming from exhaust?

they say 10lbs per 1000 rpm.

What does "power" have too do with this? If you don't have a clue then don't post!

 

[Tanya]

What does "power" have too do with this? If you don't have a clue then don't post!

because an engine usualy runs its best right before it grenades :sarcasm:

 

[SupraMario]

because an engine usualy runs its best right before it grenades :sarcasm:

Only the 5 and 6m's do that...7m is beast!

 

[airhead04]

Wow lots of questions, ok, here it goes:

as of now 3000rpms is equaling about 25psi oil pressure
Have no clue oil or oil filter being used, the engine was rebuilt right before I bought the car. Ive ran it for about 600 miles so it needs a oil change. There are no leaks that I know of. The most pressure Im getting when I floor it, is 28psi so I dont think thats good.

But when I start the car it usually goes to about 30psi??

 

[airhead04]

Pistons have ZERO relation too oil pressure!

When you say "sits at 35 psi" at what rpm? What rpm are you seeing 25psi? What psi do you see at 3000rpm? What oil are you using? What oil filter are you using? When was your last oil change? What's your oil pressure at idle?

Oil pressure has too do with bearings and engine rpm only....unless you have an oil leak so bad that it's shooting oil out but you'd have blown the motor by now.....we need all these questions answered or else helping you is impossible!

35psi is what the oil pressure use to be when it was at or around 3000rpms, now it only gets to 25psi tops. At idle it sits just above th "0" line at the bottom of the oil pressure gauge.

Im running the stock pressure gauge, just so you know. In case that makes a difference

 

[TurboStreetCar]

Buy a real oil pressure gauge and post your oil pressure at idle and at 3000rpm. Flooring it has nothing to do with oil pressure. RPM and bearing clearance as stated previously are the only factors besides heat and oil viscosity.

 

[airhead04]

Buy a real oil pressure gauge and post your oil pressure at idle and at 3000rpm. Flooring it has nothing to do with oil pressure. RPM and bearing clearance as stated previously are the only factors besides heat and oil viscosity.

Haha, ok. Itll be a while before I can purchase 1 though. Im seventeen, so Im workin with what I got. But for now is there anything I should check?

 

[gaboonviper85]

At 3000 rpm you should see 40psi on a stock system! On idle you should see 10-20 psi....all these are with a hot engine ofcourse...

I do indeed think there is a problem but it's obviously not a leak as you're not using oil....this leads me too believe that either the old oil pump was reused without checking it...or bearing clearances are off and you are eating up your bearings! I recomend changine your oil and filter asap but do not throw it away!!! Cut the old filter appart and look for flakes!! Put your old oil in a container and strain it out with some papertowel too inspect for bearing particles!

Run a recomended oil such as "royal purple" 0-30w...and see if that helps.

You should have changed the oil about 7 times by now as it was a rebuilt motor and you gotta keep clean oil in it as alot of metal wear happens in the first few hundred miles!

 

[gaboonviper85]

because an engine usualy runs its best right before it grenades :sarcasm:

funny how that works:-(

 

[airhead04]

At 3000 rpm you should see 40psi on a stock system! On idle you should see 10-20 psi....all these are with a hot engine ofcourse...

I do indeed think there is a problem but it's obviously not a leak as you're not using oil....this leads me too believe that either the old oil pump was reused without checking it...or bearing clearances are off and you are eating up your bearings! I recomend changine your oil and filter asap but do not throw it away!!! Cut the old filter appart and look for flakes!! Put your old oil in a container and strain it out with some papertowel too inspect for bearing particles!

Run a recomended oil such as "royal purple" 0-30w...and see if that helps.

You should have changed the oil about 7 times by now as it was a rebuilt motor and you gotta keep clean oil in it as alot of metal wear happens in the first few hundred miles!

Oil change will be happening asap. Ill check for flakes of metal also when I change the oil.

 

[tekimp]

At 3000 rpm you should see 40psi on a stock system! On idle you should see 10-20 psi....all these are with a hot engine ofcourse...

I do indeed think there is a problem but it's obviously not a leak as you're not using oil....this leads me too believe that either the old oil pump was reused without checking it...or bearing clearances are off and you are eating up your bearings! I recomend changine your oil and filter asap but do not throw it away!!! Cut the old filter appart and look for flakes!! Put your old oil in a container and strain it out with some papertowel too inspect for bearing particles!

Run a recomended oil such as "royal purple" 0-30w...and see if that helps.

You should have changed the oil about 7 times by now as it was a rebuilt motor and you gotta keep clean oil in it as alot of metal wear happens in the first few hundred miles!

Royal Purple 0-30w???

How about 5-30w???

SO much wonderful advice, darn... WAIT! I still have the old oil filter, just changed my oil... also have mysterious disappearing oil... ugh... lots of problems... BUT... I LOVE the cut the oil filter technique. Definitely doing that tomorrow! Great Advice man!

 

[gaboonviper85]

Royal Purple 0-30w???

How about 5-30w???

SO much wonderful advice, darn... WAIT! I still have the old oil filter, just changed my oil... also have mysterious disappearing oil... ugh... lots of problems... BUT... I LOVE the cut the oil filter technique. Definitely doing that tomorrow! Great Advice man!

5-30 is fine but 0-30 is better for cold starts....both oils act as a 30w at op temps...but 0-30 is a bit thinner at room temp which means it flows better cold than 5-30...either way both oils are fine just don't get some heavy 20-50 (although it will increase pressure it will minimize flow which is very bad!)

well find out where your oil is going...does the car smoke on startup, full throttle (high rpm) smoke?, decel (let off the gas) smoke, any oil in you intercooler? Etc

too the op: if possible I'd like too see a video of you in neutral with the car running...and very slowly increasing rpm till you hit 4000 rpm...then hold steady for a bit then back too idle while showing the tach and oil guage! If you could do than then life would be super!

 

[TurboStreetCar]

At 3000 rpm you should see 40psi on a stock system! On idle you should see 10-20 psi....all these are with a hot engine ofcourse...

Idle Spec is 4.3psi idle (650rpm idle), and 30-71psi at 3000 RPM. As per TSRM

As for oil recommendation, German Castrol Syntec 0-30 is among the highly recommended and is also easy to source.

I believe the bottle look like this, anyone verify? Reason i ask is it says European formula not German.

 

[sk6471]

As for oil recommendation, German Castrol Syntec 0-30 is among the highly recommended and is also easy to source.

I believe the bottle looks like this, anyone verify? Reason i ask is it says European formula not German.

GC is the European Formula. It's not called German Castrol because of what's on the front of the bottle, but because it says Made in Germany on the back.

 

[TurboStreetCar]

GC is the European Formula. It's not called German Castrol because of what's on the front of the bottle, but because it says Made in Germany on the back.

Yea i was pretty sure that was it, just wanted to make sure.

Ive herd of a few people not being able to find it, but i have seen it at every auto parts place around.

 

[Bri7man]

I has the same problem as you which is why my motor is apart in my garage waiting on champion toy parts.

My bearings were great and so was oil pump spec, shimming it anyways and new oil squirters hoping pressure will return.

Curious to what you find out!

 

[gaboonviper85]

Idle Spec is 4.3psi idle (650rpm idle), and 30-71psi at 3000 RPM. As per TSRM

As for oil recommendation, German Castrol Syntec 0-30 is among the highly recommended and is also easy to source.

I believe the bottle look like this, anyone verify? Reason i ask is it says European formula not German.

I know the tsrm spec thank you! I also know that 90% of the supras out there have more idle oil pressure than 4psi.

The op obviously noticed a sudden change in oil pressure there for something has indeed changed...be it his stock oil guage failing, oil bypass valves in the pump and filter housing failing, stock pump is out of spec, squirters need replaced or whatever....I'm trying too give him easy things too check first! Royal purple is German (simply used it as an example as every store carries it damn near!). There is only a handful of problems that will effect oil pressure and the op is the only one who knows what the pressure on his motor "typically" is...just cause it's still within Toyota spec does not mean something is wrong....for all I know or we know, nothing is wrong at all!