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- - Engine oil (http://zr1.net/forum/showthread.php?t=24550)

What oil and what viscosity are good for the LT-5?
I heard amsoil is good but you really can't get it at the local
Auto zone..

How about the Mobil-1 brands?

Mobil 1 high mileage in 10w30 here. I can buy it anywhere in the proper weight and Marc says it has enough zddp.

I use Amsoil ZROD 10w30 it has enough ZDDP, seems goo.

lorne #1748

I mix 3 qts of Amsoil Z-Rod to 5 or 6 qts of Mobil1 that I get in jugs at Walmart. The additive package in the Z-Rod is overkill for our application, but I roughly figured out that my blend approximates the additives available in 1990's vintage oil. One 12 quart case of the Amsoil will last for 4 oil changes (3-4 years for me). I also choose to blend because it is a little pricey to run Amsoil.

Quote:

Originally Posted by mike100 (Post 218653)

I am thinking you can pick up Mobile 1 at Walmart for about $6 a quart. I get Amsoil 10w 40 delivered for about $10 a quart. I do not have to drive 5-20 miles to WalMart. And I do not have to concoct my own Oil Mix for the ZR1 ;)

And I know Amsoil is the correct oil just because.......actually because Marc says so Engine Oil Technical Information

I like to "treat" my LT5s with the best :thumbsup:
But then again....I am one to replace liners if I find a minor scratch or imperfection :sign10:

http://i287.photobucket.com/albums/l...129d0d14b0.jpg

Amsoil AMO ZDDP specifications:
Phosphorus 1265 ppm
Zinc 1378 ppm
Recommended for the LT5 engine. Also for other engines with high tension valve springs.

The 5 quart jugs at Walmart come out about $5 a quart. ($24-$26 usually)
I buy more than one to minimize trips to witness the human circus.
I also stock up on oil filters.

I use CastrolGTX 10W-40 Diesel. It has the necessary amount of zinc and phosphorous needed. And I have been using it for nearly 4 years on re-ground cams. Lobes look new. Get it in the 5qt jugs.

I just wanted to let you know that I am an Amsoil dealer/distributor and can help with all your lubrication needs. I use it in my zr1. It is great stuff