Oil
Thread Starter
|
Mountain Pass
Joined: May 2003
Posts: 232
Likes: 16
From: Milwaukee USA
Oil
I'm a long term user of Amsoil products but my question is this is a new engine build. I took a 302 and stroked it to a 331. Compression will be about 10:1. I live in Wisconsin so its doesn't get much above 90 but it does get below zero. Any thought on proper weight for a good Amsoil synthetic to run? old vehicles always were 10W30 or 10W40 around here and any new vehicle is now a 5W or 0W/20.
Hotshot
Joined: Feb 2004
Posts: 10,837
Likes: 2,612
From: The Shenandoah Valley
Any thought on proper weight
In an older engine build, I'd use 10W-xx oils fore break in.
Mountain Pass
Joined: Oct 2023
Posts: 163
Likes: 59
From: Kaslo, BC, Canada
I am having a Hi Output (300+ HP) 4.9L six Built by an engine builder I have used for decades. If an engine is using flat, as in non roller lifters' he uses Lucas hot rod 20W50 oil for break in and suggests running that for the life of the engine. Lucas Hot Rod oil has 3000PPM of Zinc. Modern engines running 5w30 or 0w30 are running with bearing tolerances in the 1-2 Thou range where as earlier engines ran bearing clearances in the 4-7 Thou range. Modern synthetics will indeed prevent proper ring and valve seating if used too early in the life of an engine. I had a roller rocker 5.0L engine that he built for me and the recommendation was to run mineral oil for the first six thousand miles and "Drive it like you store it" from day one.
More Turbo
Joined: Aug 2017
Posts: 605
Likes: 156
From: NJ
I just did a 289. I used Penzzoil Platinum 10w30 and yes on the zinc. I used an additive, after break in use it on the next oil change as well. Will save your cam from failure especially hydraulic flat tappet
Trending Topics
Tuned
Joined: Sep 2019
Posts: 384
Likes: 198
From: Port Charlotte, Florida
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Tuned
Joined: Jan 2021
Posts: 254
Likes: 103
From: Longview Texas
Just my thoughts, Motorcraft synthetic blend has sufficient zinc for our old school engines. I run it in my 460 and my ecoboost. I agree with running a 30wt oil with additive in a freshly rebuilt flat tappet engine. Also don't baby it during break-in!
Lead Driver
Joined: Oct 2018
Posts: 7,893
Likes: 2,371
I use Valvoline VR1 because it's intended to be used in flat tappet engines and it's easy to find, I use it in roller cam retrofits as well because it's great oil.
If you want to use Amsoil AFTER the break in they make a classic car oil with zinc.
If you want to use Amsoil AFTER the break in they make a classic car oil with zinc.
Thread
Thread Starter
Forum
Replies
Last Post
GotFord83
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
9
Apr 25, 2012 01:00 PM