Engine Oil Part Number ?
Just before I bought my GT 2L JTS in April, the car was serviced by a main dealer who put in engine oil with the part number Z10922121.
On all the previous visits, the dealer had used 'engine oil - racing' part number z16181716 which I assume is Selenia 10W60.
Now, here's my dilema.....I didn't check the last service details and assumed they had used Selenia 10W60 as they had done on all the previous services. I've been duly topping up with Castrol Edge 10W60 (a bugger to find, thank god for ebay !) when I think I may have only needed 10W40.
So, my question is, if 10W40 was used on the last service, will the litre and a bit of 10W60 do any harm ?
Secondly, can anyone confirm whether part number Z10922121 is in fact 10W40 - I've google'd, and forum searched it but no trace.
Finally, can I top up with 10W40 in the future ? It's a bit easier to find.
Thanks in advance !!