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Originally Posted by pothole
Greetings all
Having scoured the forum, it seems Castrol Syntec 10W40 would be the preferred oil for my 2.5. However, I can't find much reference to this oil in the UK it certainly does not appear on Castrol's UK website.
I also note that on the USA site, there is no longer a Syntec oil, rather there is "Castrol Edge with Syntec Power technology".
There are Castrol Edge oils in the UK - Castrol Edge and Castrol Edge Sport. But neither is available in 10W40. Closest is 0W40.
Any ideas whether this is just a branding issue / are there differences in the way oil grades are rated either side of the pond?
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It seems to me this is all brought on by the never ending quest for reduced emissions & increased fuel economy regardless of the impact on engine wear. In the USA it seems Castrol is seperating the new oils into emissions compliant & "specially formulated for classic cars" with the most obvious difference is removing zinc & lower viscositys for cars with cataylitic converters. I believe 10-40 is the best viscosity for 40 degree & warmer M96 engine operation. Castrol is owned by BP so maybe you could pop into their office & tell them what we want for oil along with resonably priced higher octane petrol!
