I did not want to hunt down zinc and a good additive package so Amsoil it is. Good performance and i am not wondering when my flat tappet cam will get wiped out...

Been using for years motor runs great

I have streetrods and antique cars. Z-Rod is a life saver in these older flat tappet engines. Wouldn't use anything else.

1

Excellent product that I use in my 54 Chev 1/2 Ton. 235 runs so smooth.

Love this oil

One of the bottles had a small leak as I noticed an oil stain on the outside of the box. The leak was small and not much oil came out. But before I could even contact Amsoil, I had already received a new replacement bottle! Now that’s great service!!! Thank you Amazon!!

Excellent, Work is expected

Great oil

Great for classic cars that have flat tappet lifters and vehicles that sit through the Winter.

Good product and good protection for my small block

Looked around, read many reviews, and spoke to a few other owners, and Z-Rod was always recommended. Now I see why-pulled the heads after 15k miles on my rebuilt 400 motor, and was amazed at the lack of wear. Z-Rod for life!

Best oil on the market for flat tappet engines. I use it in my streetrod and have had absolutely no problems with cam lobe wear. I rebuilt engines and use this in all flat tappet engines I build with no problem to date.

Great oil for my camaro

Always use in older hot rods. Never had any cam/lifter issues because of good additive package. Great confidence in product

My Iconic 427 loves this Z rod oil.

Z Rod makes my '66 Impala run better than ever before. Took away the harmonics at highway speeds, idles smoother, I actually had to turn the idle down. I would recommend for any engine with a flat tappet cam or classic.,,

It is great to have a 100% synthetic oil that has the additives for old flat tappet engines. I have 2 collector cars that have there original engines and sometimes sit for a few weeks between drives. When you have 60 to 70 year old engines they need the bet oil to keep them starting and running without bad noises, even on cold starts.

THIS product comes highly recommended by my motorhome club because it is rated for older engines with flat tappets. I have had my first oil change only a few miles ago on an engine showing 80,000 miles on the odometer So far it is a good product. Oil pressure is high on a 1978 GMC 403 powered motorhome. I have ordered an additional 12 quarts giving me a stock of 16 quarts until my next oil change. IF my engine burns off one quart (which is typical of these engines) I will be able to top it up twice and have sufficient oil on hand for another such oil change and top-up. This should do me for the entire year 2022 and most of 2023! Stay tuned. If there is a problem I will report it however, I doubt I will have anything bad to say.

The only oil I use in my 1930 Ford with a BB Lincoln. It has made several cross-country trips and it keeps on going.