Engine oil Shell or Mannol

First oil change after filling with T-6 on my 2002 Saab 9-3 (that didn't have a kit on it) I bought with 130k miles on it was really black, almost a bit sludgy. Next few oil changes quickly got better as the detergent broke down sludge in the top end and cleaned the motor up.

I used Rotella T6 for the past few years and no issues

oks yang oil

pero maybe wag mo sagarin sa 6K

go for around 3k-4k dun mo na palitan

I am using shell advance ultra 10w-40 and hindi pa ako nagkaproblem dito sa oil na ito.

Motul H-Tech 100 or Shell Helix Ultra

ito gamit ko sa nmax V1 ko for 4 years, sobrang smooth ng makina, at sa sniper 150 ko naman ng 2 years, wala din ako naging problem sa makina, at sa nmax V2.1 ko ng 4 years wala din ako naging problem. Ito din gamit ko sa ADV 160 ko ngayon sobrang swabe sa makina, tahimik na tahimik. Mahal nga lang talaga 500+ pesos ang price nito pero sulit.

Still using the casa oil which is Shell Helix Ultra 0W-20

Last change oil ko sa Shell, inabot ng 3200php including oil filter then Shell Helix SUV fully synthetic 5W-30 ang oil na ginamit.

Personally I use 5w-30 because it's the cheapest. I've used 0w-20 and 0w-30 in the car also. Can't tell what is in the car at any given time as it runs exactly the same regardless so just use the cheapest that's still up to the relevant specifications.

I run the diesel Rotella T6 5w-40. My catalytic converter decided to start throwing P0420 codes around 58k miles and I spoke to a shop that I am going to have tune my car and one of the techs said that they reformulated T6 a few years ago and it has more zinc in it than it used to and that might have had an effect on my cat and it's early demise.