A friend of mine is a Amsoil distributor. I want to run Amsoil in my 79. I have ran it in my Truck, Wife's Blazer and my 86 Z28 racecar for years. He said he has used Amsoil product code AMO-QT for years with flat tappet cams and never had any problem. So my question is, is this oil good to run in my 79? I have read about needing high zinc oil in the older Corvette's. The engine is not stock I don't have all the specs but, I know it has a 270 duration cam and a edelbrock torker II knock off intake, headers and a 670 SA carb.

Thanks,
Rick

 

I have run the AMO QT (actually the AMO TP) QT stands for quart, I buy the 2.5 gallon jug "TP" high zinc in my 383 since built & it's all you need!! I too run a flat tappet cam.

 

Thanks for the quick reply and good info. I was just reading this thread http://forums.corvetteforum.com/c3-t...d-line.htmland it seems that it is what most use with the exception of those that want to use a 10-30 and Amsoil has just came out with a high zinc 10-30. I live in North Florida and 10-40 should be fine for this area. I am glad that my friend was right I bought 7 qts AMO from him today.

 

Amsoil came out with Z Rod oil with high zinc content. Have not tried it yet...not cheap though....almost $9 a quart in single quarts.

 

Rotella T 15W40 available in 1 gal jugs for $12 or so at Wallyworlds everywhere. ~1200ppm of zinc, just what you need.

 

No comment on the diesel oils stick with the AMO and relax. Done, move on & drive & enjoy!!

 

Nope.

The International Lubricants Standards Approval Committee (ILSAC) CJ-4 (diesel) specification states a maximum of 1200 ppm phosphorus, and oil analysis typically shows significantly less. Also, the additive package is significantly different than gasoline oils.

No reason to use a diesel oil when there are so many other good choices.

http://forums.corvetteforum.com/c3-t...ppet-oils.html

 

Sorry but 'Yup'

1) Directly from Shell Tech support on July 25th 2011:

"Rotella T 15W-40 has 1200 parts per million of zinc anti-wear. This is the same level that passenger car motor oils had up to the year 2000. Today passenger car motor oils are limited to 800 ppm zinc. Thank you for your interest in Shell products"

2) From a field sample taken July 7th 2011 with 4428 miles on the oil, analysis done by Blackstone

 

...and I have 4 other analysis that show ~800 PPM. These analysis were highlighted in the "new vs. old" Rotella anecdotal discussions on numerous boards.

Regardless, diesel oil has a very different additive package than is intended for gasoline engines...and again, there are too many other good choices to roll the dice.

Owner's choice, of course - but I can't understand why anyone would risk it.

 

For the million time, forget Diesel oils! As noted above and many times before, diesel oils contain a different additive package than gasoline engine oils and there is absolutely zero reason to use a diesel oil in a gasoline engine with so many appropriate gas oils available! NONE! Enough with the Shell Rotella T for 30+ year old C3's! Where the heck did the stupidity of running diesel oils in corvette engines come from?

 

How about you two guys read up a little:

http://stlouisncrs.org/news_files/St..._July_2011.pdf

Starting on page 3.

Talking about 'stupidity' where did the idea come from that Rotella (for instance) is exclusively for diesels? It also carries the API SM and previous S category certification.

 

i have been reading for years here that the new rotella had half of that amount of zinc. im not going to risk it. lots of VOA showing that.
Plus here in S FLorida 15w40 is wayyy to thick.

 

As an aside, API SM limit P to 800 PPM, and SL to 1000 PPM.

Diesls use a very different additive package. 'nuff said.

How about we just leave the post right here - folks can read and make up their own mind.

 

For the clueless, directly from Shell's web page that clearly states that Shell Rotella T is specifically targeted to DIESEL engines:

"PROVEN PERFORMANCE

Diesel engines are a special breed, providing more power and higher torque, but with higher compression ratios. They also produce more soot. And the new, lower-emission diesels can run at extremely high temperatures, shearing oil at a much higher rate. Shell Rotella® Energized Protection™ adaptive technology offers the advanced protection your diesel pickup engine demands, without compromising performance. And it’s proven itself again and again—in the lab and in miles of real-world experience.

Shell Rotella® T Triple Protection® formulation has seen over 40 million miles of on-highway testing. That means it’s shown outstanding performance even when it’s subjected to high engine and oil temperatures, which causes extra soot and acids to be dumped into the oil. That’s a lot for an oil to deal with. Once an oil can protect in the most extreme conditions, then we’re satisfied it can protect in your truck.

The Shell Rotella® family of heavy duty engine oils delivers the right performance for your diesel pickup truck. From Shell Rotella® T Triple Protection®, to Shell Rotella® T5 Synthetic Blend Technology, to Full Synthetic Shell Rotella® T6, no matter what you drive, your engine gets the Energized Protection™ performance that meets its needs."

Done!

 

Good grief, folks - does this need to get so heated?

Run whatever you want, and let other folks take the information provided and make up their own minds.

 

Time for a few of you to have a Coke and a smile. No need for the thread to turn into a pissing match. Trust me, it won't end well for those involved.

 

Yes, Rotella is targeted (marketed) towards diesels. It is not reserved exclusively for diesels from a technical point of view.

As Billla says, run whatever you like.

 

Would you agree that the additive package is different for a diesel oil?

We'll avoid the good/bad thing - but you'd agree different?

 

Not being familiar what is chemically different between the two, in a analytic, descriptive way, I can't comment.

Do you know?

 

...or supplement your favorite oil with ZDDP or GM's EOS. A lot cheaper than $9.00 a quart.