When my car was serviced it had Castrol 10W-60 Edge Sport put in. It then needed top up, went back to the dealer they gave Castrol 10W-60 Edge Sport Titanium FST. Now again I need another top up went back to the dealer and now they are selling me Castrol 10W-60 Edge FST.

I know they are all 10W-60 but is ok to mix the different types?

 

The real question you should be asking is, why do you need so many top-ups?

Mixing the different types is not an issue as long as they are all synthetic (and that is just for the mileage interval between changes - in other words, the oil change interval between a full synthetic, synthetic blend or non-synthetic is different).

 

And another real question - why 10W-60? I didn't think any 60 weight oil had the Porsche A40 approval rating.

 

Isn't that weight too thick? Maybe they think you have an E46 M3?

 

That seems to be a tad thicker than normal...?

 

Thanks for the responses! In UK 10w 60 is quite commonly used by Porsche specialist.

It used a lot of oil as took car to max event where it did around 25 top speed runs.

 

Interesting. I have done 20 1/2 mile runs in one session. Oil level didn't change. I would think 60 weight is incorrect for this engine. There are a lot of factors the manufacturer uses to choose oil viscosity. Higher viscosity could effect internal engine clearances.