BMW 740 Is Castol SLX Long Life II HTHS 3.0 FullySynthetic

[tp947]

I found an old container of Castrol SLX Long Life II HTHS 3.0 SAE 0W-30 in my garage - can someone kindly confirm if this is a fully synthetic oil?

Although I bought it for my Audi A4 3.0 (2004), would it be suitable for my 2001 BMW 740i 4.4?

Many thanks in advance

[motco]

Look for the manufacturers' specifications on the back of the container.

[tp947]

Unfortunately it doesn't say if he oil is fully synthetic or not anywhere on the container. I am about 99% sure Castrol SLX is fully synthetic as I think The Edge replaced it but I just wanted to double check on here before using it.

[motco]

Surely it's part of the spec - synth or not?