Valvoline and liquimoly both recommend 5w30
If you are asking about ultimate best, royal purple, amsoil Signature series, Redline, pennzoil
Guys on dealership don't even know ABC of engine and gear oil grades
Don't expect any satisfactory answer from them
@chinyoti please share your experience, will help others too
Zic and totachi both are sort of okayish
Personally I'm not a huge fan of both (totachi especially, there are already threads In which totachi is already discussed, check all those, it's just a normal oil hyped up by entertainment on wheels guy)
Now question is, Why I recommended valvoline?
For me it's good value for money oil
In severe it's recommended for 7500 kms, coupled with genuine oil filter which is recommended for same 7500 kms under severe conditions, one oil change every 7.5k kms is light on pocket too and as it's one of trusted old brands, peace of mind too