F6 Engines With 100,000Km +..

[FPV6T]

Hi guys,

it has probably been asked before but I would like to know if I should be using a "thicker" oil for my F6 since it has clocked up nearly 115000km.I am currently using Nulon 10w-40w synthetic and have been since 60000km and not had a drama,and I change it every 7500km.Also another question is what psi should my oil pressure guage be reading when the engine has reached operating temperature eg: 20psi?? 30psi

I would appreciate your replies.

Ed.

Edited 06/05/11 07:32 AM by fpv6t

[aiboart]

I have an XR6-T with 105k km.

It has always run on 10W-40 Magnatec using oil and filter change intervals of 7k km.

It runs absolutely perfectly in all respect. Power delivery (according to the G-tech accelerometers) and refinement are as new, actually better. It has never used so much as a drop of oil.

Keep up with what you are doing. Change nothing.

A thicker oil, say a 10W-60 increases friction, increases heat generation and reduces performance and economy. As it flows more slowly (in road conditions), it also reduces heat transfer by the oil and reduces dynamic lubrication (static lubrication is improved due to the viscosity increase). This is not ideal.

However, when everything gets very hot, such as in track work, the above no longer applies. The hot oil is now at the required viscosity and the hence the flow rates are back to where they need to be to maintain dynamic lubrication and heat transfer.

There is also no need to increase the value of the 'W' number, as in going from 0W-40 to 15W-40

The 'W' number does not denote the absolute viscosity of the oil.

The 'W' number is a relative value. It means that, for example a 10W-40 multigrade behaves like a 10 weight monograde when cold and a 40 weight monograde when hot.

Now for the puchline.

A 10 weight monograde is many times thicker when cold, than the 40 weight when hot.

In other words, the 40 weight when hot is much, much thinner than the 10 weight when cold.

Regards,

aa

Edited 06/05/11 12:36 PM by aiboart

[FPV6T]

thanks for the info mate,appreciate it.I think I will keep using the Nulon 10w-40 synthetic as I have had no problems with it..

[arronm]

My F6 runs 25psi at idle and 50-75psi between cruising and 6000rpm.

[RHR]

Stick with the oil you have. Should be fine

[FPV6T]

  On 07/05/2011 at 3:24 AM, arronm said:

My F6 runs 25psi at idle and 50-75psi between cruising and 6000rpm.

thanks Arronm,my runs at about 22psi @ idle and between 50-60psi while driving,just want to make sure it's within a "normal" range.