What weight motor oil do you run in your Vortec engine?
 

So what weight motor oil are all you guys running in your 4.3 vortec engine? and just curious, what brand is it? are you using an oil with a higher Zinc content in it?

thanks

I have been using Royal Purple 5w30 full synthetic, but my last change was with Mobil 1 0w30 synthetic to see if it helps with fuel economy - not so far, 500 miles later. I'm not sure about zinc content or what benefit it would provide.

I stick with the factory recomendation of 5W-30. I do use full synthetic (Mobile 1) in all my cars. I was tempted to try to 0W-30 but my instincts told me to stick with what I have been using.

I have been using Amsoil 0w 30 Signature series for the past couple of years.
I am here in the Midwest. I have been getting 15-16mpg in the city and 22-24 on
the highway. It's pricey but I love the stuff. I change it every 15,000 miles along
with their recommended oil filter.

still running 5w30 oil even after 131,000 still has great oil pressure, lol

Regular old Penzoil 5W30 since I bought my blazer new back in Oct 2000. Change the oil every 3000 miles. I've got 184K on it now and the engine still runs strong.

I use Havoline 10W30. At my last used oil analysis, the zinc content was 850 ppm. I've never done a virgin oil analysis on it, so I don't know what the zinc content is out of the bottle. Since the moly count in the UOA runs ~360ppm, I'm not so concerned with the zinc content as an anti-wear additive.

i use Castrol gtx high mileage 10w 40 because i live i texas, and the temp. get up in the low hundreds. and my blazer has 199234 miles

I use 10W40 from May to September, and 10W30 from October to April. My Sonoma has 121k Miles on it, and runs great. I use Pennzoil. The biggest thing is changing the oil at the right intervals and never being cheap when it comes to quality parts and oils.

161,xxx miles. not a drip of oil anywhere.

mobile 1 full synthetic 5 30