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Castrol 5w30 V 10w60

monga

By monga,
in Engines & Forced Induction

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D_Stirls Veteran

D_Stirls

Posted
Posted (edited)

The 60 is when the oil is cold and you want your oil to be think on cold start to protect the engine from wear. is more the smaller number that is inportant because that is the thickness when hot which is what your engine spends most of it's time being. If you look at what nissan suggests for our climate and they recomend 10W-30/40/50. For 5W-?? the climate they suggest for this is around 10 degree max. If i was on my computer i could post the chart up from the manual, i can do it later if people are interested.

Edited by D_stirls
a20089 Veteran

a20089

Posted
Posted
The 60 is when the oil is cold and you want your oil to be think on cold start to protect the engine from wear. is more the smaller number that is inportant because that is the thickness when hot which is what your engine spends most of it's time being. If you look at what nissan suggests for our climate and they recomend 10W-30/40/50. For 5W-?? the climate they suggest for this is around 10 degree max. If i was on my computer i could post the chart up from the manual, i can do it later if people are interested.

I think you have that totally backwards.

The lower number is how the oil acts when cold (in the case of a 10-60 weight oil the oil acts as if it is a 10 weight oil (thin) when cold.

The higher number "60" reacts the same as a 60 weight oil (thick) when hot.

All engine oils get thinner when hot, so the oil will not be physically thicker when hot.

When cold you need a light oil to move from the sump to all the parts that need the oil to lubricate. In a freezing temperature climate ie Canberra in Winter 5w engine oils assist in starting the car and limiting engine wear.

Most of the engine wear on a normal car occurs at startup where there is limited lubrication.

Better re-read that chart.

D_Stirls Veteran

D_Stirls

Posted
Posted
I think you have that totally backwards.

The lower number is how the oil acts when cold (in the case of a 10-60 weight oil the oil acts as if it is a 10 weight oil (thin) when cold.

The higher number "60" reacts the same as a 60 weight oil (thick) when hot.

All engine oils get thinner when hot, so the oil will not be physically thicker when hot.

When cold you need a light oil to move from the sump to all the parts that need the oil to lubricate. In a freezing temperature climate ie Canberra in Winter 5w engine oils assist in starting the car and limiting engine wear.

Most of the engine wear on a normal car occurs at startup where there is limited lubrication.

Better re-read that chart.

Yep sorry i have the numbers around the wrong way;

But here's the chart;

post-27020-1209911315_thumb.jpg

discopotato03 Grand Master

discopotato03

Posted
Posted

The 10 or 10W is not a viscosity its a cold pouring index . So 20w50 is not 20 weight oil when its cold .

Synthetic oil is supposed to be quite "thin" when it's cold like very cold and this would be a huge advantage at start up .

Plenty of people like the Edge 10w60 but if the 60 number scares you Mobil do a synthetic 15w50 from memory .

If I was pushing a turbo engine hard and for any length of time I'd use the 10w60 too .

A .

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