5 GT Turbo Which oil please

[Reg10]

Hi I have a 91 gtt
Will this be ok a see people using 15-40 Semisynthetic
Only need 3 litres ?

 

[andybond]

We have a deal with opie oils whichever you decide to use!

 

[Reg10]

Ok thanks for moving into right section

 

[andybond]

Personally I am not a fan of the GTX stuff. I use Millers.

I think @Brigsy recommends 10w60 but I might be wrong. Any input @Brigsy or @Mart?

 

[Reg10]

I think 60 is for high tuned engines
So I may just do 15-40
As so many different Opinions if you look on the Internet it’s so awkward

 

[DaveL485]

I think 60 is for high tuned engines

Incorrect. Viscosity is given in a standard format as you know, like 10w60. The number preceding the W is the viscosity at -17.8 Celsius, the lower the number, the thinner it is in the cold.

The numbers after the W is viscosity at 100 Celsius and represent the oil’s resistance to thinning at high temperature. The higher the number, the thicker it is at 100°

On a GT Turbo i'd probably go for a 5W for decent cold circulation (unless you live somewhere very cold) and a 50 for hot, because the old 1960's engine design and tolerances wont like super thin oil when hot and pressure will drop off. I wouldn't be shy of a 60 if I expected to beat the shit out of it on track.
I would NOT use 50 or 60 in a modern engine like the F4r, for that i'd go for a 0W30 or 5W30.

This is simply about viscosity at temperature x, and what is suited to your engine based on design, age, tolerances, wear levels and usage. You can base it from the OE recommended and then allow for the aforementioned parameters and technological improvements in the interim. As said above, I use a 5W50 in my J7R and always fully synthetic.

 

[Reg10]

Incorrect. Viscosity is given in a standard format as you know, like 10w60. The number preceding the W is the viscosity at -17.8 Celsius, the lower the number, the thinner it is in the cold.

The numbers after the W is viscosity at 100 Celsius and represent the oil’s resistance to thinning at high temperature. The higher the number, the thicker it is at 100°

On a GT Turbo i'd probably go for a 5W for decent cold circulation (unless you live somewhere very cold) and a 50 for hot, because the old 1960's engine design and tolerances wont like super thin oil when hot and pressure will drop off. I wouldn't be shy of a 60 if I expected to beat the shit out of it on track.
I would NOT use 50 or 60 in a modern engine like the F4r, for that i'd go for a 0W30 or 5W30.

This is simply about viscosity at temperature x, and what is suited to your engine based on design, age, tolerances, wear levels and usage. You can base it from the OE recommended and then allow for the aforementioned parameters and technological improvements in the interim. As said above, I use a 5W50 in my J7R and always fully synthetic.

Thanks for great reply mate very helpful
I got this now

 

[Reg10]

Comma xt2000 15-50 semi

 

[Brigsy]

10/50 fully synth Total Quartz Racing. Cheap and decent, dont buy the castrol gtx its shit.