Great product. Tried and true. I changed my oils and ended up parking my car for 3 years. Checked my oil and it was in great condition and the motor runs fantastic for a 13 year old block

Perfect stuff for a classic engine with flat tappets

Amsoil is hands down the best out there, any product they make is high quality! Huge thank you to amsoil and there team, pleasure to do business with!

Z-Rod 20W50 is perfect for my 1939 Ford flathead V8 engine. Easy start up and even lowers engine temps and better oil pressure than the 30W Oil that was the norm a long time ago! Great product.

What I've been using for the last few summers in my 64 Impala's swapped 350. I feel good about using synthetic in it.

Ever since I first used Amsoil I will not use anything else. I had a tired 1999 Jeep Cherokee and changed the 2 axles, transfer case, manual trans and engine over. Not only did it run a ton better I picked up 2mpg with just that change!!! That was back in 2005ish. Ever since my motorcycles and all cars/trucks run it. This particular formula is used in a 1972 Plymouth Satellite Sebring Plus restomod. It had a 408 magnum stroker and A518 overdrive trans. Living in WI it's usually parked from late October to late April. Having extra rust prevention properties really does give piece of mind the engine will be good when in hibernation. Wonderful product! Thank you, Jeffrey

Great stuff car ran well

I use this for my boat. It runs great and seems to run cooler than with other oils. The high zinc is good for the marine engine.

The Z-Rod oil save from having to mix additives to modern motor oil for all our old cars. Not knowing the exact concentration of the additive (not listed on the bottles) getting the correct amount of zinc was always a guess. Z-Rod eliminates the guess work. Don't know if Z-Rod is really necessary but I have over 200,000 miles on several old flat tappet from the 50's and 60's with no wear and no oil usage.

Great oil . I rely on it in both of my small block circle track racing engines

The best for pushrod engines

This is the best oil you can buy Does a car eng. good !!

Dropped my water temp by 12 degrees !! Great product !

Great oil, run it in our Briggs animal kart motors on methonal... Keeps the motor at cooler running temps

We run this in our imca 604 crate engine works great

Works great in my supercharged Vette!

Great product and customer service

Necessary to maintain the 1966 396 engine in my Super Sport. Full synthetic has many added values over conventional oil especially in cars that get low mileage, irregular usage.