Engine oil additive/flush prior to oil change - Pontiac GTO Forum
User Tag List

 
LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 05-14-2019, 09:22 PM Thread Starter
 
Join Date: Aug 2018
Posts: 54
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 17 Post(s)
Engine oil additive/flush prior to oil change

Wondering about using one of the many oil additives (Amsoil, for instance) to the existing oil in a stock 400 engine 68 GTO prior to doing an oil change. I am just now taking ownership of the car and really don't know anything about the service history on the car. Going to use Lucas oil with the zinc properties from now on, but thinking maybe a little extra TLC with getting the old existing oil out might be in order.....anybody have experience in this area or advice? I have pretty much always thought such additives aren't worth the $$$$ as long as there is regular scheduled maintenance, but in this case, I dont know what the maintenance has been. Thanks!!
jayvee53 is offline  
Sponsored Links
Advertisement
 
post #2 of 3 (permalink) Old 05-16-2019, 03:57 PM
64-67 Expert
 
geeteeohguy's Avatar
 
Join Date: Feb 2008
Location: Fresno, California
Posts: 8,457
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 98 Post(s)
Don't do it. Simply warm up the engine, drain all the old oil out, install new oil and filter and you'll be fine. I've been in the auto industry since '79, and have seen many of the 'flush' additives cause internal engine problems. The solvents can strip the oil film off of bearings and cylinder walls and camshaft lobes, causing scoring. On really dirty engines, it can loosen sludge and allow it to move around and plug up oil passages. No good. With detergent motor oil being the standard for the past 50 years, you have no need to use snake oil in your engine. Just drain and fill with high zddp oil and run it. I've worked on old antique cars for a long time, and some of those engines that were run prior to the mid/late '60's DID have a lot of sludge from the use of parafin-based non-detergent oils. In your case, that doesn't apply.
geeteeohguy is offline  
post #3 of 3 (permalink) Old 05-19-2019, 08:53 PM Thread Starter
 
Join Date: Aug 2018
Posts: 54
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 17 Post(s)
Thanks for the good advice...I was thinking any additive might do more harm than good!
jayvee53 is offline  
Sponsored Links
Advertisement
 
Reply

  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO Complete Engine Compartment Discussion

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Pontiac GTO Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Questions prior to rebuilt engine/cam break in olde-goat 1964-1974 Tempest, LeMans & GTO Engine Tuning and High Performance 5 04-25-2013 09:52 AM
Need to flush old auto oil out or not fiesta62 1964-1974 Tempest, LeMans & GTO Technical and Electrical Wiring 10 12-16-2011 09:15 AM
Internal Engine Flush Cleaner For '66 Gto take5 1964-1974 Tempest, Lemans & GTO Complete Engine Compartment Discussion 15 12-18-2009 11:05 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome