HP JNKEY

Should I use Mobil 1 or go to some other synthetic like Royal Purple or Amsoil? What weight oil are you using? How many quarts does the a Z51 LS3 take?

RRVettes

Mobile 1 here.

not08crmanymore

mz6 z51= 6 qts.
Stick w/mobil one.

sprinkler

Penzoil Platinum here. Cheaper than Mobil 1 and from what I understand , just as good. Any oil that meets the GM specs 4718M and 6094M will be fine.

Swiftrider08

No sense in pinching pennies with your oil. Use Mobil 1 5W-30 and AC filter PF48. 6 whole quarts for the LS3 with Z51.

larvette

6 qts. Mobil 1 5w30 - AC Delco PF 48 oil filter

moolys

I have been using AMsoil since O5 good stuff I have it in my trans and diff

j_digi454

5.5 Quarts LS2 with F55.

2 GRUMPY

5w30 Mobil 1

*FAÇADE*

Mobil 1 5w30

johnodrake

Any oil you want to use as long as it meets GM Spec
GM4718M.....

ZeeOSix

Cheaper than $4.50/qt like you can get Mobil 1 for at Wally World in the 5 qt jugs?

Rocketmanwpb

Over the life of the car you might save a hundred bucks, why would you care, use what is recommended, the car was tested and developed with Mobile 1 5w-30W.

Mad*Max

LSTHREE

Mobil 1. Sams wholesale-6 qts=31.?? Not bad for DIY.

Maui

Costco had the 6 quart boxes of Mobil 1 for $21 last month. I bought four and should have bought more.

ZeeOSix

Yep, I pick a couple of the on sale Costco 6-packs up too. Wonder what the self life is of new oil? I would have bought more, but some of it would probably sit for years since I only change oil once a year due to low mileage use.

larrysb

I recommend an ice cold beer or three!

Patman

It's better actually, based on the oil analysis results I've seen. Everyone assumes that just because the Corvette comes from the factory with Mobil 1, that GM somehow "recommends Mobil 1" Nowhere in the owner's manual does it say that they recommend this oil. And don't assume that it's the best oil out there just because it's the factory fill. The decision to make Mobil 1 factory fill was decided more in the boardroom than it was in an engineer's office. (in other words, it's a business decision, not a decision made by the engineers testing)

ZeeOSix

You have to realize that Mobil 1 was around way before any of these other full synthetics - except Amsoil, but Amsoil was not full blown commercialized like Mobil 1 was. GM has been using Mobil 1 for many many years now. They probably had a multi decade contract with Mobil 1 that was sealed a long time ago.

I doubt the difference in performance between any of these full synthetics is even going to make a difference in real world use anyway. Even old dyno oil is way better than it use to be ... just change it when you're supposed to and it will all perform well.