Amsoil Z-rod oil, Yeah another OIL thread. Options

[Olympic 914]

Got an S&S crate motor for the Harley and the Indy put in some Amsoil 20W50 V-twin.

went down the rabbit hole looking at this and other Amsoil products and saw they make a High ZDDP oil called Amzoil Z-Rod, synthetic and specified for flat tappet engines.

Anyone here have any experience running it in our engines??

 Amsoil_20W50.pdf ( 213.73k ) Number of downloads: 47


Kind of expensive, But for what the crate motor cost, its a small price.

[technicalninja]

I've also heard of the long drain intervals for Amsoil. No reason to doubt the oil's ability to handle it, but there's no way I'd do that in a vintage aircooled engine. Even if driven regularly. Half of the reason to drain oil regularly is to get rid of combustion by-products that build up in engine oil. There's no way to get around that, and the best oil doesn't eliminate that requirement.

I completely agree!
Blake and I expected the old school Fiero (86) to wipe out its oil sooner.
The Blackstone reports are extremely detailed and show debris levels.
The 200K 30-year Fiero was a tiny bit dirtier but not what we were expecting.
His testing regime took 3 years to complete. He's got a "book" of reports.

I advise early car, non-boosted at 5k synthetic, 2.5k dino

Late 10k with synthetic (100%- not a "blend" 1% synthetic is a bend!). I use Mobil1 as it has 95% of the qualities of the Amsoil at 40% of the price.
Boosted or high RPM 5K with synthetic. 2-3K with dino.

For the most part I use Mobil1 exclusively.
The only straight up Dino oil I have right now is some special GTX20/50 for "cLassics" with high ZDDP. This oil I bought specifically for my 75 for initial ressurection mileage.

Good chance I'll change to the Amsoil stuff mentioned in this thread...