Is oil vicosity related to oil pressures?

[azzad]

Sorry I actually meant is rx super actually a high detergent oil or is that just what the salesman or mates mate said.

Dazza

[Yom]

being that its designed primarily for agricultural and american diesel applications i'd say it would be

[azzad]

being that its designed primarily for agricultural and american diesel applications i'd say it would be

With that analgy you could say any diesel engine oil "that is designed for agricultural and american diesel application" was a high detergent oil.

My point behind the question was I didnt want hear-say or a guess.

Dazza

[Yom]

its all in the marketing.


there's usually a little graph which allows you to compare oils performance to other oils from that same manufacturer.

[love ke70]

well, i compared my oil pressures a while ago when switching oils from HPR diesel, to rimula X, and recorded them, in this table.

TD42, 200odd thousand km, with penrite HPR diesel 20w60 in the first column, and shell rimula X 15w40 in the second, both after about 30 minutes driving, fresh oil and filters each time, only about a week between the two readings.
RPM........ penrite.....shell
750.........18........15
1000.......30.........18
1200.......34.........22
1500.......40.........30
2000.......44.........38
2500.......47.........43
3000.......50 ........45


what do people think of these results?
as the shell stuff has aged its lucky to see 40 PSI when hot at 2500-2800 rpm, rarely rev far past this for long to take a good look at oil pressure.

whats peoples thoughts?

cheers

[hillbilliywheelchair]

have u cheked your filter on many ocasions i have lost alot of oil presure due to the oil filter being to restrictive

i run bp vanillus c330 in all my vhicles which is a high deturgent straight 30 waight oil whi8ch is for trucks and tractors

[brad-chevlux]

well, i compared my oil pressures a while ago when switching oils from HPR diesel, to rimula X, and recorded them, in this table.

TD42, 200odd thousand km, with penrite HPR diesel 20w60 in the first column, and shell rimula X 15w40 in the second, both after about 30 minutes driving, fresh oil and filters each time, only about a week between the two readings.
RPM........ penrite.....shell
750.........18........15
1000.......30.........18
1200.......34.........22
1500.......40.........30
2000.......44.........38
2500.......47.........43
3000.......50 ........45


what do people think of these results?
as the shell stuff has aged its lucky to see 40 PSI when hot at 2500-2800 rpm, rarely rev far past this for long to take a good look at oil pressure.

whats peoples thoughts?

cheers

what i think is, it proves the thicker oil makes more pressure.

doesn't show anything for the condition of the engine or oil pump or for the quality of each oil. Doesn't show anything for wear rates or for the ability of the oil to remove impurities and prevent buildup.

[love ke70]

well obviously a list of oil pressures is only going to show that the thicker oil creates more pressure. and not its ability to perform its myriad of tasks
my question was, do the pressures on the rimula x seem high enough to give protection at high load, low rpm points?
and are those the sort of pressures people would expect, or do my results seem a bit low?

cheers, andy

[brad-chevlux]

i'd be happier with the pressures you're getting from the HPR.

[fnqcairns]

Oils aint oils, the battle is not oil pressure within reason it resistance to shear. What happens when a person has a 1l of the highest quality oil for a td4.2 say dello 400 15w 40 then adds, viscosity improver to push it to a 60wt? it scraps that good oil, it is now 1l + the viscosity improver + other additives to pull it all together.

If a person is going to run an oil look for an oil with the smallest difference between the first and second number - less viscosity improver added = better shear stability.

lot's more to picking a true quality oil although still along the line of overweight oils, they increase the temperature between journal surfaces where it is squeezed, the temperature here sky-rockets! - not good!

No way no how would i like to put any Penrite engine oil in my truck, but I would be physically sick pouring overweight HPR in.

Go the dello or rimula and save the engine the abuse of running the so many average and below average oils out there.

[brad-chevlux]

Oils aint oils, the battle is not oil pressure within reason it resistance to shear. What happens when a person has a 1l of the highest quality oil for a td4.2 say dello 400 15w 40 then adds, viscosity improver to push it to a 60wt? it scraps that good oil, it is now 1l + the viscosity improver + other additives to pull it all together.

If a person is going to run an oil look for an oil with the smallest difference between the first and second number - less viscosity improver added = better shear stability.

lot's more to picking a true quality oil although still along the line of overweight oils, they increase the temperature between journal surfaces where it is squeezed, the temperature here sky-rockets! - not good!

No way no how would i like to put any Penrite engine oil in my truck, but I would be physically sick pouring overweight HPR in.

Go the dello or rimula and save the engine the abuse of running the so many average and below average oils out there.

Finally. some one who agrees with me about Penrite.

[MuddyTroll]

Just touching base.

It's been around 7,000kms since my initial post.

Used Penrite and as I initially stated, the pressure was all good, the engine sounded good and the power was as good as it was going to get.

Sad to say that after only 7,000 I have lost alot of power. The engine struggles to startup cold and the oil is no longer doing anything to quiet the engine down. Very dissapointed at the longevity of the oil. The pressure is almost non existant once the engine warms up.

I will have to move the next change forward a bit. I won't be using Penrite though. The sales pitch was that it was the best oil available. The proof is that I have never had a worse result from any other oil I have ever used.

So to those people who warned me about Penrite. Thankyou, you were right.

Dave

[brad-chevlux]

Just touching base.

It's been around 7,000kms since my initial post.

Used Penrite and as I initially stated, the pressure was all good, the engine sounded good and the power was as good as it was going to get.

Sad to say that after only 7,000 I have lost alot of power. The engine struggles to startup cold and the oil is no longer doing anything to quiet the engine down. Very dissapointed at the longevity of the oil. The pressure is almost non existant once the engine warms up.

I will have to move the next change forward a bit. I won't be using Penrite though. The sales pitch was that it was the best oil available. The proof is that I have never had a worse result from any other oil I have ever used.

So to those people who warned me about Penrite. Thankyou, you were right.

Dave

try fuchs ultralube 1540 diesel.

[fnqcairns]

Just touching base.

It's been around 7,000kms since my initial post.

Used Penrite and as I initially stated, the pressure was all good, the engine sounded good and the power was as good as it was going to get.

Sad to say that after only 7,000 I have lost alot of power. The engine struggles to startup cold and the oil is no longer doing anything to quiet the engine down. Very dissapointed at the longevity of the oil. The pressure is almost non existant once the engine warms up.

I will have to move the next change forward a bit. I won't be using Penrite though. The sales pitch was that it was the best oil available. The proof is that I have never had a worse result from any other oil I have ever used.

So to those people who warned me about Penrite. Thankyou, you were right.

Dave

That is a big shame, not to mention the extra fuel a rubbish overweight oil uses through it's useful life, there is a lot of bulldust around oils, people are suckers for average oils for 4 reasons, marketing, expensive so it must be good beliefs, mates recommendations and manufacturers recommendations.
A person can be stuck sometimes within a warranty period to use an average oil but once outside of it science will come to the rescue if interested enough to bother.

IMO try dello not because I use it but because it does actually work well outside of all the typical bull hype, it is cheap, very shear stable, very good soot handling ability, world renowned to the highest levels in commercial trucking and lastly it contains a nice dollop of molly over and above what would already be a top shelf oil.

Heaps more to it but the above is enough to equal near any other oil out there but when price is included a person will need to double it and go to a certain and specific brand of fully synthetic to know they are doing better.

[love ke70]

how much do you know about the rimula x?
not sure whether to stick with what ive been using or go to the delo, my pressures seem a little low, but the motor hasnt been complaining, and i wont know if its causing an issue til it gets decommissioned, but the way i look at is, im making less pressure, but that must mean the oil getting to the places its needed easier, and its not like its making crap pressure...

[fnqcairns]

how much do you know about the rimula x?
not sure whether to stick with what ive been using or go to the delo, my pressures seem a little low, but the motor hasnt been complaining, and i wont know if its causing an issue til it gets decommissioned, but the way i look at is, im making less pressure, but that must mean the oil getting to the places its needed easier, and its not like its making crap pressure...

Rimula is good stuff, strictly dello is better but under a standard oil change schedule and useage it's an either/or, I would if you already trust and feel comfortable with the rimula only consider changing if the price made it worth your while.

Yeah oil pressure (within reason) is just part of the picture, a good oil in an engine protecting it well is better than an average oil protecting average even if the oil pressure looks a little nicer.

cheers

[Yom]

Finally. some one who agrees with me about Penrite.

careful someone might flame you that its the best in the world and they've run it in their truck since the beginning of time and it still goes.

[brad-chevlux]

Finally. some one who agrees with me about Penrite.

careful someone might flame you that its the best in the world and they've run it in their truck since the beginning of time and it still goes.

read the first page. they already did. it's still garbage oil though

[twodiffs]

I been using Caltex RX for ages and have never really looked at anything else. I'm a bit concerned about the 'high detergent' post so i'll keep an eye on that...unfortunately i've got enough RX to do the next 5 oil changes .

Are Delo 400 and Rimula x synthetic or semi synthetic oils?

[love ke70]

if youve been using it for ages, the high detergent factor isnt going to be an issue as far as i can tell...

[Yom]

no i'd have thought it would have been a good thing. pretty sure castrol RX is what is considered one of the higher detergency oils, havent read anything since which would suggest otherwise (take note though, all diesel oils are high detergency compared to petrol oils)

sludge and varnish clog things up and if they're hiding other problems then nothing you can do will escape the simple fact that you have to fix something eventually.

[twodiffs]

Phew...thanks, i feel better - the engine has done approx 170000k so too early to stuff it.
Will still be keen to to try Delo or Rimula one day, might alternate the changes between them and RX every 3 months.

[brad-chevlux]

Phew...thanks, i feel better - the engine has done approx 170000k so too early to stuff it.
Will still be keen to to try Delo or Rimula one day, might alternate the changes between them and RX every 3 months.

don't do that. pick one and use it.

[bogged]

my question was, do the pressures on the rimula x seem high enough to give protection at high load, low rpm points?

Nick (woop) ran from new his 89 model GQ on Rimula X.. 5000klms oil and genuine filters each time.

At 550,000 took the head off, and you could still see cross hatching in the bores from new... - so does it protect?? Fawkin oath.

There were photos in his engine rebuild thread but were lost when the server died.

I ran it in my GQ, and now the GU.

[love ke70]

did he do bearings at the same time? how were they?
ive seen a few cars with huge blow by issues, pull the head and still see the crosshatching in the bores, seems to be rings and ringlands that are more of an issue these days, no more wearing a groove in the bore,but good to hear it can make a motor last that long

[azzad]

Does anyone use engine flush when doing an oil change?

If so what brand and how often do you use it, every oil change?

Does anyone know if engine flush evaporates after time and doesnt contaminate the fresh oil?

Dazza

[love ke70]

in a as good as sealed system, wheres it going to evaporate to?

unless it goes out through PCV, but i dont think it would really work like that.

and with the engine flush stuff, isnt it just the same as running a high detergent oil where you can upset sludge and move it from somewhere not causing harm to getting stuck and blocking a big end journal or a piston squirter etc?

[azzad]

Its not a sealed system as you have pointed out. I dont know what engine flush is made up of to know if it will even evaporate, I was imagining something solvent based?

I dont know the answers which is why I asked.

Dazza

[love ke70]

that was an edit once i made the original sealed systemstatement, then thought better of it.
so apologies

[Yom]

dont think the engine flush available on the shelf at supercheap or from CEM is quite aggressive enough to break chunks of grime and cause damage.