Get this, one of the best oil you can get in market.
If you wanna bring your own oil than total 5w30 is best oil for bucks. Fullysynthetic api sn and ilgsac5 rated.
I used mobil 1 5w50 in my 1.8 cvti for 35k kms with 10k drain intervals. Price was too much for me as well. I have switched to total 5w30 at 84k kms, and there is no noticeable difference. Fuel economy slightly improved.
As far vibration at 2-2.3 k rpm is concerned than that is due to a wrong viscosity of oil imo.
In the end, yaar i'm not a senior I might be younger than you. Capsat sir and Xulfiqar sir are senior
citizens
No offense