25 replies to this topic

[Cygnet45]

Just a quick question.
Which oil should I put in my 1275mpi? The book says 10/30 but I live in Spain at the mo and cannot find it anywhere. Would 10/40 be ok?
Thanks for any help.

Edited by Cygnet45, 22 June 2009 - 09:24 PM.

[stardude]

what you should realy be using is 20w50, i dont know if you could find it out there though??

[Saxo-Fiesta-Mini]

20w50 as the gearbox will not be happy with anything too think rember that the gear teeth and thrashing threw the oil and breaking up all the molecules and addatives

the best one is millers classic mini oil 20w50

and i know the secret to how they make the gears sound quiete ( shhh)

[nicksuth]

I thought it was 10W40 for the MPi otherwise you bugga up the Oxygen Probe??

[stardude]

I thought it was 10W40 for the MPi otherwise you bugga up the Oxygen Probe??

that seems to ring a bell, i think you are right

[nicksuth]

I thought it was 10W40 for the MPi otherwise you bugga up the Oxygen Probe??

that seems to ring a bell, i think you are right

Twas from the mouth of Dr Guessworks and I wouldn't dispute it!!!!!!!

[stardude]

the man with a PHD on gearboxology

[nicksuth]

the man with a PHD on gearboxology

So famous I put his name up in lights (every time I press the brake pedal

[attachment=86616:IMG00089...621_2133.jpg]

[spiguy]

I thought it was 10W40 for the MPi otherwise you bugga up the Oxygen Probe??

Is there a difference between the SPi and MPi O2 sensor? If so, then does that mean that the same applies to an SPi? I am lost as to why the oil viscosity would affect a sensor which sits in the exhaust gas. Is it something to do with mineral vs synthetic?

[the.stroker]

well i use halfords classic green 20w 50 in my 93 cooper SPI,have done for three years now with no problems

[WiredbyWilson]

There was a write-up in mini mag a few months back stating that 20w50 has NO effect on the sensors of an MPi / Spi.

Remember kids the gearbox in an mpi/spi is identical to a carb'd one - you need thicker oil in the 'box or it will die a death!

[spiguy]

There was a write-up in mini mag a few months back stating that 20w50 has NO effect on the sensors of an MPi / Spi.

Remember kids the gearbox in an mpi/spi is identical to a carb'd one - you need thicker oil in the 'box or it will die a death!

Sounds right to me. I mean, why should it? Not only is the gearbox the same, surely all the tolerances etc are the same throughout the production life of the engine, and so the suitability or otherwise of different oils will be unchanged?

none of the sensors are in direct contact with the engine oil anyway.

[KLAS]

the oxygen sensor strongly dislikes ZDDP and some other stuff in older oil. and yes, this gets burnt and reaches the sensor. the cat reacts the same
the viscosity has nothing to do with this, but the API classification.

and its a big myth that a gearbox needs thicker oil. ever seen gearbox oil? its very thin

[nicksuth]

the oxygen sensor strongly dislikes ZDDP and some other stuff in older oil. and yes, this gets burnt and reaches the sensor. the cat reacts the same
the viscosity has nothing to do with this, but the API classification.

and its a big myth that a gearbox needs thicker oil. ever seen gearbox oil? its very thin

???? I always thought Gearbox Oil was of higher viscosity ???? Like the old Hypoid 90 and 140

[KLAS]

???? I always thought Gearbox Oil was of higher viscosity ???? Like the old Hypoid 90 and 140

no, as you can not realy compare the numbers.
gear oil will always have higher numbers than engine oil even if the gearbox oil is thinner.
a 10W engine oil is around the same viscosity as a 75W gear oil.

and both are desinged completly differend. gear oil can handle pressure very well but has less ability to handle combustion byproducts