What oil are y'all using?
 

I was just curious to what what oil everyone is using and what y'all recommend for my suburban its a 94 6.5 with 230,xxx miles. Thanks

Rotella 15-40 in my 6.2

im running rotella sae-30 in my turboed 6.2

Valvoline Peemium Blue Extreme 5w40 for my 1999 6.5td during these winter months.

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Was using Delo 400 for years, but a rep. from DA Lubricants came in to my shop, so I have been using it for about a year now. They did free oil sample reports for me to show me their oil was superior to Delo. So I decided to try them out.

Rotella is the way to go...the weight of oil would depend on where you live and the climate there...I live in Kentucky...I use Rotella T3 15-40 in the warmer months and T5 10-40 in the winter months....my motor is 30 years old still runs like a new one...

Rotella 15W40 in my 6.5 Castrol SAE 30 in my 6.2

*2
Although in Canada I use 10-30 in the winter,and I seldom tow in the snow.
Towing I would likely want the 10W40 in the cold or year round for that matter if it was readily available.