MG HS

[Jetronic]

2 degrees C a few nights ago. Cold enough to trigger a TPMS warning for the front tyres when starting. But it got a bit hotter (12°C) and no more warnings.

Still had 2.2 bar of air in all 4 tyres when the warning was triggered.

 

[Jetronic]

Another few weeks passed, another tank of fuel aswell. Consumption is going up as the temps drop, but that's not unusual, it takes about half a rip now to get the coolant up to operating temp.

dropped below 35 mpg this time. 34.74 mpg. Cold and wet, so the windscreen gets damp and I run AC to keep it clear and dry out the insides of the car somewhat..

 

[svenson]

i always thought that Brussels had a bad weather, at least this is what i hear from politicians at euro parliament.its pretty mild for north country.

ICE might not be totally abandoned since europe decided to run ICE engines but with e-fuel..so lets wait and see.

what is the oil approval, grade range from the factory for this engine in the manual?

fuel consumption should be calculated 2 points more than what they claim in average on the manual.then add exploitation, city,short trips e.t.c.

 

[svenson]

Oh, this is the oil I will be useing in it:

​

jetronic
i searched and i found your engines oil viscosity is 0-20.you are getting 10-30!
as we talked before you dont care about approvals or viscosity. you get what you think right for an oil.so, isnt there a problem getting in the engine a more viscous oil? out of normal approvals? a so thick oil doesnt affect bearings and engine in general?

 

[Jetronic]

jetronic
i searched and i found your engines oil viscosity is 0-20.you are getting 10-30!
as we talked before you dont care about approvals or viscosity. you get what you think right for an oil.so, isnt there a problem getting in the engine a more viscous oil? out of normal approvals? a so thick oil doesnt affect bearings and engine in general?

yes it affects engines and bearings, that's the whole point of doing this. More viscosity provides more wear protection, and more room for fuel dilution.

I've been running 10W-30 for nearly 5000 km now.

 

[svenson]

. More viscosity provides more room for fuel dilution.

care to explain this? you want fuel dilution? i dont get it..

i have seen members here discuss that we can put a thicker oil always ,having more protection more hths and so on..but an engine that is suggested to put a thin oil such as 0-20 ,isnt it dangerous to go so thick 10-30? i mean i would understand to go for as thick as a 5-30 but 10-30 ,isnt too viscous? too thick to reach the bearings all along the engine?

 

[YZJB]

care to explain this? you want fuel dilution? i dont get it..

i have seen members here discuss that we can put a thicker oil always ,having more protection more hths and so on..but an engine that is suggested to put a thin oil such as 0-20 ,isnt it dangerous to go so thick 10-30? i mean i would understand to go for as thick as a 5-30 but 10-30 ,isnt too viscous? too thick to reach the bearings all along the engine?

No. 10W-30 is not too thick at all, so long as it’s not trying to start the engine well below freezing.

 

[Bailes1992]

care to explain this? you want fuel dilution? i dont get it..

i have seen members here discuss that we can put a thicker oil always ,having more protection more hths and so on..but an engine that is suggested to put a thin oil such as 0-20 ,isnt it dangerous to go so thick 10-30? i mean i would understand to go for as thick as a 5-30 but 10-30 ,isnt too viscous? too thick to reach the bearings all along the engine?

Consider this, think how thick oil is when it's cold. If it couldn't 'fit' between parts within an engine, then every engine would seize when it was cold.

Also, the '5w' or '10w' is the winter rating and has little to do with the hot viscosity of the oil.

 

[Jetronic]

care to explain this? you want fuel dilution? i dont get it..

i have seen members here discuss that we can put a thicker oil always ,having more protection more hths and so on..but an engine that is suggested to put a thin oil such as 0-20 ,isnt it dangerous to go so thick 10-30? i mean i would understand to go for as thick as a 5-30 but 10-30 ,isnt too viscous? too thick to reach the bearings all along the engine?

I don't want it, but it could happen, this mitigates the viscosity loss if it does happen

 

[svenson]

Consider this, think how thick oil is when it's cold. If it couldn't 'fit' between parts within an engine, then every engine would seize when it was cold.

Also, the '5w' or '10w' is the winter rating and has little to do with the hot viscosity of the oil.

sure..ok,with hot viscosity..but why car companies provide a specific range of winter rating for each engine? mine approvals bmw ll01 or ll-4 is from 0-30 to 5-40 for example for Mediterranean countries, and they don't include a 10w which would be more suitable for our mild climate with temps around 10 C on winter? the way i see it we could use 10-40 too. is it possible that these 10w are not rated from car companies as longlife oils? has to do with additives perhaps? bcs. jetronic find a very good oil concerning consistency of additives and base oils on a 10w.

I don't want it, but it could happen, this mitigates the viscosity loss if it does happen

ok, understood ,thanks..i thought ''provides more room for fuel dilution '' means the opposite of what you explained to me.

 

[Jetronic]

sure..ok,with hot viscosity..but why car companies provide a specific range of winter rating for each engine? mine approvals bmw ll01 or ll-4 is from 0-30 to 5-40 for example for Mediterranean countries, and they don't include a 10w which would be more suitable for our mild climate with temps around 10 C on winter? the way i see it we could use 10-40 too. is it possible that these 10w are not rated from car companies as longlife oils? has to do with additives perhaps? bcs. jetronic find a very good oil concerning consistency of additives and base oils on a 10w.

The fuel effciency tests start with a cold engine, so they want the oil to be as thin as possible on a cold start for that test. Every gram of CO2 counts, they even go as far as cheating (Mercedes got caught using special gearboxes once, with extra polished gears and some gears missing as those were not used in the test).

Another reason is, speccing 0/5W-30/40 means the blenders need to use a good bit of synthetic oil. It's saying they only want synthetic oils, without saying they only want synthetic oils. 10W-30 could be made from mineral oil, and 10W-40 is most of the time semi-synth.

 

[Jetronic]

Had to jumpstart a beater today. Went to work and noticed one of the neighbours (about 50 houses away from my place) begging for a jump start.

Hooked the MG up to his Peugeot (with TU engine, I think it was a 306), started the MG then let him start his Peugeot and it fired right up. Only needed to remove a plastic shield over the positive batter terminal, but that was easy enough.

 

[svenson]

The fuel effciency tests start with a cold engine, so they want the oil to be as thin as possible on a cold start for that test. Every gram of CO2 counts, they even go as far as cheating (Mercedes got caught using special gearboxes once, with extra polished gears and some gears missing as those were not used in the test).

Another reason is, speccing 0/5W-30/40 means the blenders need to use a good bit of synthetic oil. It's saying they only want synthetic oils, without saying they only want synthetic oils. 10W-30 could be made from mineral oil, and 10W-40 is most of the time semi-synth.

so i guess,the 0/5w they are speccing, its all about fuel efficiency/longer oci bcs. of little synthetic and not that ''this engine and bearings are designed for these oil weights'' we usually read on here and its a false opinion.

 

[OVERKILL]

so i guess,the 0/5w they are speccing, its all about fuel efficiency/longer oci bcs. of little synthetic and not that ''this engine and bearings are designed for these oil weights'' we usually read on here and its a false opinion.

That, and it allows for universality. Porsche can spec a 0W-40 and it's appropriate from Fairbanks to Vegas.

 

[svenson]

That, and it allows for universality. Porsche can spec a 0W-40 and it's appropriate from Fairbanks to Vegas.

i learned here the rule''as thin as possible'' ..... ? 0 or 5 are the most possible numbers close to thin rule.

which means if we find an oil out of the approvals list ,a 10w ,20w and its suitable for our climate we can put it in our engine without hesitation? i mean an exceptional oil with good specs like these that jetronic uses.

the specs on jetronic's engine oil is using are outstanding..not hpl, not mobil 1 0-40,or even 300v motul have such impressive numbers..and its not made for cars but its the best one for it. why someone look for another oil.? price is normal too.

 

[OVERKILL]

i learned here the rule''as thin as possible'' ..... ? 0 or 5 are the most possible numbers close to thin rule.

The adage was "as thin as possible, as thick as necessary". For an engine that might require the HTHS of a 40 grade at operating temperature, 0W-40 is where it's at there, in-step with the adage.

which means if we find an oil out of the approvals list ,a 10w ,20w and its suitable for our climate we can put it in our engine without hesitation? i mean an exceptional oil with good specs like these that jetronic uses.

the specs on jetronic's engine oil is using are outstanding..not hpl, not mobil 1 0-40,or even 300v motul have such impressive numbers..and its not made for cars but its the best one for it. why someone look for another oil.? price is normal too.

This random 10W-30?

 

[svenson]

The adage was "as thin as possible, as thick as necessary". For an engine that might require the HTHS of a 40 grade at operating temperature, 0W-40 is where it's at there, in-step with the adage.

i know the rest of this adage,,but yeah ,i forgot that thick -thin means hths not grade..my bad. got carried away with this conversation.

 

[Jetronic]

Gonna link this here, same engine as the MG has.

Seems to me like bad maintenance leading to oil getting into the combustion chamber is the root cause of this failure. I will do what I think is needed to keep this from happening. It doesn't look like LSPI to me, just plain old knock.



Nice wide bearing surfaces for the cams, oil pump inside the sump, oil cooler, cooled turbo, I don't see anything particularly poorly designed. The maintenance shedule may be though.

 

[Jetronic]

oh, just noticed mine doesn't have a vacuum pump, it gets vacuum from the intake manifold. So not 100% the same engine.