Have done a search and found very differing results, but non usuing Mobil 15w50 Oil.

My specific question relates to oil pressure on my MY02 WRX which is run on Mobil 1: 15w50 Motorsport Oil. I recently fitted an oil pressure gauge (along with Oil Temp) and am getting the following readings:

Cold Idle: 7.0 Bar (approx 101.5 PSI) - in other words max position on the gauge.

Warm Idle: 3.6 Bar (approx. 52.2 PSI) - does tend to fluctuate above & below these figures slightly - depending on temps etc.

Warm - Anything over 1800 - 2000RPM: 7.0 Bar (approx 101.5 PSI) - in other words max position on the gauge.

Note: These pressures are with approx. 90 - 95 deg oil temp.

Do these sound too high?

 

Thats similar to the temp mines sits at too, using millars oil this month, last month it was slightly lower at high temp using comma oil. I get my oil changed every month.

Might try a motul next month tho.

HTH

Ricey MY01 WRX (75K on the clock)

 

Cheers for quick response!

Just got me wondering if the 7.0 Bar constant above 1800 - 2000 RPM sounded high - the others (Cold & Warm Idle) seems to be a good average from searching on here. Not found any others with Warm Oil pressure this high though - as long as it isn't a bad thing I'm happy! Mine's done around 40K by-the-way.

Anyone else get similar pressures?

 

BTTT

Anyone else get similar pressures?

 

my my02wrx gets just the same but i use motul 15 \ 50 with 35k and original internals but running 386 bhp

 

I'm not sure what oil is in mine but it runs at 6.5-6.6 bar most of the time, slightly less on a really hot day but I haven't seen it drop below 5.9 bar or reach 7 bar.

 

Cheers for the reply's guy's - seems that some do seem to have higher Oil Pressure then - guess this depends on the oil grade used.

Anyone actually using Mobil 1 Motorsport 15w50 with gauges fitted that can tell me what readings they get?

 

Nobody else using Mobil 1 15w50? Surely someone is.....?

 

Some folks on here must use Mobil 1 15w50 and have gauges - just want to know what readings you get to compare.

 

This is a old thread.
But want to share my experience because i was worried too.
on my WRX2002

Cold Idle: 7.0 Bar (approx 101.5 PSI) -
Warm Idle: 2.5 - 3.0 Bar (approx. 50 PSI) - does tend to fluctuate above & below these figures slightly - depending on temps etc.

Warm - Anything over 1800 - 2000RPM: 7.0 Bar (approx 101.5 PSI) -NOT max position on the gauge,but dont runs more than this.

Using ELF 15w/50.

WRX Especifications says:
1.0 bar(14 psi) OR MORE on idle
3.0 bar (43psi) OR MORE at 5000rpm.

It seems a lot for me, but everyone is experiencing same values.
My concern is that car is operating over Oil pump Relief valve operation that works at reach of 5.0 bar (5.0 kg/cm2, 71 psi) or valve is working all the time?
Is there any problem??

 

Similar for me in my 03 WRX. In mine RCM put Silkolene Pro R 15w50.
Cold is 7 bar.
Tickover is 3 to 3.5 bar when hot.
Hot and running is 6 bar.
Thats on my Defi's.

 

Unless your cars are heavily modded, you are using oil that is too thick, it should be a 5w-40 ideally.

Cheers

Tim

 

are sti's different? mine on cold start is just over 6bar ? (6.2)

hold idle 2.2/2.4 bar depending on temps..

using 10w 50 millers cfs

lowest i have seen on hot idle seems to be just a tad over 2bar. 2.05 i'd say but that was at 110 or so degrees oil temp. never normally stays up there.

normally 100 degrees max on the road..

 

how many miles do you do a month? why do you change monthly?

 

Yeah cus RCM obviously have no clue about Subaru's do they! LOL
Define heavily modded? My car should be 220 bhp and is now minimum 300 to 330 bhp, with torque around 340 lb/ft.
But like I say, opinions and arseholes and all that....................

 

I have a forged classic which i run on 10/50 CFS millers,i have a gauge which reads to 100 psi and it is maxed out on cold start so over 7 bar and then around 40-50 psi on warm idle depending on oil temps.
If i give it the beans i can see it max out when hot but usually around 90-95 psi when driven normally so your readings don't seem to high to me mate.

 

It is not about RCM's knowledge of Subaru's. It is about how an oil behaves in an engine accross the temp range, the Subaru's oil requirements are no different to any other modern 4 stroke engine from a lubrication point of view, the oil has to do the same job in all engines. So all the same rules apply. If your engine is not getting hot enough, then 15w-50 can be too thick especially if the car is a daily driver and used on cold mornings with cold starts. Have you seen the difference in the viscosity of a 15w oil and a 5w oil at 0 degc? This directly relates to how well the oil will flow around your engine when you turn the key.

Do you have an oil temp guage? Any idea what the oil temps are when hot?

Cheers

Guy

 

No I have no idea on the oil viscosity.
My oil when hot averages mid 90's and hits 100 plus at times. It's never tracked or heavily thrashed. Has covered 102k miles n I've had it from new. Every garage I have used have used either 10 or 15w50. Thx

 

OK, the SAE50 the second number will be fine if pushed hard, but to be honest at those oil temps the engine was designed to run at SAE30 and SAE40 the mods are largely irrelevent in this case, it is all about oil temps.

The more important thing is the 15w, fine if a track car but if used on a daily or regular basis then 5w or even 10w will be a benefit.

Cheers

Guy.

 

As a note on thicker oils... My car currently runs 10-50 (almost exclusively track days, and even then not many per year).

On cold startup, it takes about .5-1 seconds before the oil light goes out, and this nver used to happen on thinner oils (e.g the 5-40 i used back when the car was a daily drive).

For my car and my circumstances, i'm ok with the way the oil performs on cold starts, but for a daily drive it cant be good, so careful that youre not getting sucked into some "its used in motorsports so it must be better" kind of argument - its probably not true

 

aye, temps matter.

Hence I run 5w-40 Motul 300V in the summer and winter, unless it is incredibly harsh out (like now. -30C cold starts) when 0w-40 goes in for the winter.

This on a ~300hp WRX, after my engine work is done (~450hp fingers crossed), ill switch to a 10w-50/10w-60 for summer and a 5w-40/0w-40 for winter.

 

See I love all this talk about oils, opinions and arseholes..........................
Please list for me exactly what is going to happen using the oil that 3 of the best Subaru garages have put in my car. Keep talking about cold starts and winter, fine. Means nothing. My car has done 102k miles, let me know what is about to fail, fall, off, blow up, melt. LOL.
It takes longer to warm up as its thicker, so what!?!?!?

 

My car has done 100,000 miles and runs exclusively on fully syn 5W30.
It is a re-mapped de-catted MY06 STI which enjoys being driven hard (when warm) and gets tracked at least twice a year.
According to the 3 best Subaru garages it should fail,fall, off, blow up, melt. LOL?
My view is you should listen to various advice and then make your own mind up.
Not quite sure why you like to go around calling people arseholes though?
It's not big and it's not clever

 

You may be lucky, nothing may go wrong, but using a less than ideal oil reduces the life of an engine. It increases the wear throughout the engine, if it's lubricated by oil and you're not using the right one, it gets worn more so is more likely to fail.

 

cster I will clarify that. It's the first half of a phrase " opinions are like arseholes, everybody has one!"
I was not calling anyone on here.
My other comment was asking all those "experts" on here what is going to fail on my car due to thicker oil? You see, unless you strip my engine down, saying my oil is too thick is a statement you just cannot prove! Of course lower W = thinner cold. BUT, give me proof why my 15w is no good. Although I am due a service in March so may be tempted to use 10w50. Lol.

 

You're right, it can't be proven without stripping the engine, but what we're saying is that if you use the right oil, you might get the engine to last longer

 

Possibly but again what is that based on? Numbers only at the minute I think. I need to see bits of metal ! Lol

 

What you say is true.
The only question I would ask from the info in the original post would be that if the oil pressure at cold idle is 7 bar, is the oil so viscous, that it is not actually getting to where it should go and is it able to do the job it should do.
Fuel economy might also raise its head - but since we are talking about Subarus - that is not really a consideration.
Incidentally, I would imagine the engine would warm up quicker in view of the extra friction caused by a more viscous oil, though this may be difficult to measure.

 

My car is and will always be a daily driver. I get 24mpg at the moment. That's down to Bobs remap! Lol. Only a strip down would show wear and tear though. My car is well maintained as Olly at RCM could agree to. I need to see evidence before I change oils!

 

24 mpg is pretty good. I'm lucky to get 22 and that is half A road cruising.
The B roads are another matter though.
From what I have read of this thread - maybe you and I should swap over our oil specifications