I read a great post about using Rotella T6 synthetic. The diesel oils have good qualities that work with the transmission. Its trying to find a motor oil that also works for the transmission which is the challenge.

[https://www.minimania.com/msgThread/114880/1/21/oil\_choices\_\_again\_](https://www.minimania.com/msgThread/114880/1/21/oil_choices__again_)

Read this thread. One of the posters used Rotella T6 and kept oil analysis records then did a full teardown with no wear showing at all. A lot of people are quick to have an opinion but he actually did the research and has facts to back it up

I was wondering if folks have run this oil for a while and if you've noticed any difference to other, more classic-car-specific 20W50 oils (which are usually a lot more expensive)?

Looked at older threads (https://www.reddit.com/r/classicminis/comments/6afi36/what_oil_do_you_use_in_your_minis/), it seems zddp content is something to consider. Perhaps the GTX oil with an additive?

Discuss! :)

Castrol GTX 20W50