What oil used in V6s

[jagarra]

I searched the threads and found little on answering this question. What oil is used by members in their V6's. My default on everything I own is Castrol, but maybe I might want to use something different on this engine.
On all my older flat tappet engines I use an zinc additive, is this also recommended?

thanks all,

gg

[aphaynes]

That is a great question! I can't wait to see the responses. I was thinking of trying this because of the "boosted zinc"...

http://i.walmartimages.com/i/p/00/07/31/02/03/0007310203688_500X500.jpg

...but will wait to see what folks here are already using.

[FetchMeAPepsi]

The standard I've heard is Rotella 15w 40. Here's the additive I used, recommended by Jay Leno for old cars with flat tappets. You just put a little in. 1 bottle lasts a few changes.

http://6066gmcclub.com/forum/showthread.php?t=48039&highlight=oil

Here's my thread asking the same question too when I was to that stage.

http://6066gmcclub.com/forum/showthread.php?t=47432&highlight=oil

[jagarra]

I have been using this additive for my older cars. I did notice on one of them it quieted the motor and oil pressure was staying higher at idle than before.

http://www.amazon.com/Maxx-Additive-Shipping-Internatinal-Rates/dp/B003MWF2T2/ref=sr_1_6?ie=UTF8&qid=1423079046&sr=8-6&keywords=zddp

On the Rotella, which one the T or the synthetics? I was reading the specs, seems the T would be best for our trucks.