By 
Dave, 
a 
Verified Buyer 
on 
November 18, 2022
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!!
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!
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
Best for Old Cars
By 
KEITH, 
a 
Verified Buyer 
from 
East Tennessee 
on 
August 12, 2022
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.
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.,,
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
Keep your old engines lubricated.
By 
Red Truck Guy, 
a 
Verified Buyer 
from 
Northern Calif. 
on 
April 23, 2022
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.
I have a boosted forged LS6 corvette over 700 rwhp and about 820 at the crank. I need the best oil I can get. I trust amsoil products to perform.
Years ago, I had an engine with metal fragments in the oil and using a well popular brand, and shortly, it had to be rebuilt. If I would of used amsoil during that time, I believe my engine would of been saved.
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