Shell Rotella T6 5w40 for winter weight oil?

[BMWManiac]

I use Rotella T6 in the e30 and Rotella 15w40 in the e36 M3....

[itsonlygeorge]

any reason you want to avoid the tried and true castrol gtx? It goes on sale for like $10 at walmart for a 5L jug (and I mean $10 canadian, so it's probably only like 1$ US south of the border)

Mobil1 is a better quality oil.


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[TobyB]

I used to use GTX, but the zddp went down, the price went way up, and I found those
fu*king dipstick adds really really annoying.

So I changed.

t

[Exodus_2pt0]

GTX isn't synthetic last I checked.

Zinc aside, I've seen the difference between motors that ran synthetic vs conventional. After 100,000 well maintained miles, one will be clean under the valve cover.