Apologies - I’m generally a lot more helpful with topics that haven’t been asked (many times) before or challenging technical problems.
Dont let my curt response put you off the forum - its mostly a nice and helpful place to be.
I use Millers Trident 5w30 longlife.
The search function is pretty good though there are a few very long threads where the nugget of information you need can be buried. Just try different key words in your search string.
Regards
Ian