amsoil
Go to Subdriver he is a dealer and at least the proceeds will go to Corvette forum.
As a note to all, if you go to AMSOIL's corporate website and buy from them, the price is their standard retail price and the sale and commission would be credited to a local AMSOIL certified dealer (of which I am one) in your area. Most AMSOIL dealers are not certified. If you use the reference number in my sig, the sale is credited to my dealership and part of the proceeds go to the forum. That said, I can get you dealer wholesale pricing via the AMSOIL Preferred Customer Program. PM for details if interested. Thanks!


C66 Racing #66 NASA ST2, SCCA T2
AMSOIL Dealer (Forum Vendor)
AMSOIL Preferred Customer Program (Members buy at Wholesale - a savings of about 25%)
As a note to all, if you go to AMSOIL's corporate website and buy from them, the price is their standard retail price and the sale and commission would be credited to a local AMSOIL certified dealer (of which I am one) in your area. Most AMSOIL dealers are not certified. If you use the reference number in my sig, the sale is credited to my dealership and part of the proceeds go to the forum. That said, I can get you dealer wholesale pricing via the AMSOIL Preferred Customer Program. PM for details if interested. Thanks!
The Best of Corvette for Corvette Enthusiasts
Redline and Royal Purple I have seen. I saw the Redline at a higher priced auto parts store. The Royal Purple must be the newest to come aboard. I have seen Royal Purple at Walmart and Pepboys. But I have heard about these two brands now for a long time (Amsoil and Redline) as these two have been around a long time.

I bought mine from Subdriver, then applied for a preferred membership and that is the site (www.amsoil.com) where I BUY my discounted price, so what seems to be amusing to you may I ask?






I bought mine from Subdriver, then applied for a preferred membership and that is the site (www.amsoil.com) where I BUY my discounted price, so what seems to be amusing to you may I ask?

The API has not defined "synthetic". It is accepted that Group III basestock (highly hydroprocessed mineral oil), Group IV (polyalphaolefins or PAO), and Group V (all others including polyol esters) are "synthetics". The majority of the synthetics on the market are Group III. All of AMSOIL's lubricants less the XL line use Group IV basestock. But, even that is simplistic. Go to Royal Purple or Mobil 1's website and try to determine what basestock they use. RP doesn't say and Mobil 1 uses vague language like "uses high-performance fluids, including polyalphaolefins (PAOs)." So is their basestock PAO or partially PAO or mostly PAO? Hard to tell. AMSOIL is believed to use primarily PAO, but with some percentage of Group V polyol ester added in to lower the oil's coefficient of friction and improve its compatibility with seals. As to how much, they aren't saying.
The additives are equally varied, and in many cases, particularly for API SM oils, limited by the API guidelines. For example, 30 grade oils labeled to meet API SM/ILSAC GF-4 requirements are limited to having phosphorus less than 800 ppm. As phosphorus is part of an oils primary anti-wear additive, along with zinc, that is why I don't use an API SM oil in my Z06 on the track (I use AMSOIL Dominator racing oil with zinc on the order of 1575 ppm).
So, in a roundabout answer to your question, AMSOIL buys basestock from major oil companies but they vary who they buy from to get the best balance of price/quality. They buy additives from chemical companies. They blend them all together at their processing plant in Superior WI and ship their product out to distrubution centers from there.
I've taken a few oil samples on my daily driver, an 06 CTS-V with the LS2 engine. You can see the differences between the Mobil 1 and AMSOIL in these results (such as the higher Calcium levels - a detergent). AMSOIL is not a rebadged version of Mobil 1 or any other oil.
Cadillac CTS-V Used Oil Analysis – Mobil 1 5w30 vs AMSOIL 0w30
In answer to the questions above about what retail outlet can sell AMSOIL, the short story is that AMSOIL will not distribute to nationally owned chains like Walmart. They will to locally owned businesses (usually limited to an owner who owns 12 or less stores). Most NAPA stores are locally owned so they qualify for AMSOIL retail accounts. FYI, if anyone owns a business that either uses or sells oils, getting an AMSOIL account is easy and there is no cost to businesses for this account. PM if interested.
The API has not defined "synthetic". It is accepted that Group III basestock (highly hydroprocessed mineral oil), Group IV (polyalphaolefins or PAO), and Group V (all others including polyol esters) are "synthetics". The majority of the synthetics on the market are Group III. All of AMSOIL's lubricants less the XL line use Group IV basestock. But, even that is simplistic. Go to Royal Purple or Mobil 1's website and try to determine what basestock they use. RP doesn't say and Mobil 1 uses vague language like "uses high-performance fluids, including polyalphaolefins (PAOs)." So is their basestock PAO or partially PAO or mostly PAO? Hard to tell. AMSOIL is believed to use primarily PAO, but with some percentage of Group V polyol ester added in to lower the oil's coefficient of friction and improve its compatibility with seals. As to how much, they aren't saying.
The additives are equally varied, and in many cases, particularly for API SM oils, limited by the API guidelines. For example, 30 grade oils labeled to meet API SM/ILSAC GF-4 requirements are limited to having phosphorus less than 800 ppm. As phosphorus is part of an oils primary anti-wear additive, along with zinc, that is why I don't use an API SM oil in my Z06 on the track (I use AMSOIL Dominator racing oil with zinc on the order of 1575 ppm).
So, in a roundabout answer to your question, AMSOIL buys basestock from major oil companies but they vary who they buy from to get the best balance of price/quality. They buy additives from chemical companies. They blend them all together at their processing plant in Superior WI and ship their product out to distrubution centers from there.
I've taken a few oil samples on my daily driver, an 06 CTS-V with the LS2 engine. You can see the differences between the Mobil 1 and AMSOIL in these results (such as the higher Calcium levels - a detergent). AMSOIL is not a rebadged version of Mobil 1 or any other oil.
Cadillac CTS-V Used Oil Analysis – Mobil 1 5w30 vs AMSOIL 0w30
In answer to the questions above about what retail outlet can sell AMSOIL, the short story is that AMSOIL will not distribute to nationally owned chains like Walmart. They will to locally owned businesses (usually limited to an owner who owns 12 or less stores). Most NAPA stores are locally owned so they qualify for AMSOIL retail accounts. FYI, if anyone owns a business that either uses or sells oils, getting an AMSOIL account is easy and there is no cost to businesses for this account. PM if interested.

5W30 (100% synthetic for the C6) and the 0W20 (100% synt) for my Mach 1. I noticed they didn't come w/ 5W20 grade (except for the XL5W20).
The SAE 0w20 is a Group IV PAO basestock and the better choice than the XL 5w20 for your Mach 1. I feel that you made the right choice.















