Re: [Amc-list] Oil to Use: It must be rated for 'Diesel'

[Todd Tomason <jayscore@xxxxxxxxxxxxx>]

Tom,

The issue is real enough.  The newer oil formulations are fine for a roller 
cam, but cause problems with a flat tappet cam.  This is affecting cams on 
every make.  Usually an older motor that was broken in before the formulation 
was changed is not an issue.  It's when the cam is replaced and broken in 
with the new oil that you hear about problems.  The thing that I find 
interesting is that the failure is not immediate.  There are several cases 
reported where the cam fails at around 30,000 miles.  

Here's an article from Hot Rod, and a technical bulletin from Comp Cams that 
discuss the issue in much more detail.  The information about diesel oil is 
getting a little dated.  

http://www.hotrod.com/techarticles/engine/flat_tappet_cam_tech/
http://www.compcams.com/information/whatsnew/NewsDetails.asp?ListHistoryID=1821071676

My solution is to run Castrol and GM EOS.

Todd

On Wednesday 08 August 2007 00:06, Tom Jennings wrote:
> I dunno about this oil stuff... is this one of those things like the lack
> of lead causing excessive valve wear? I know there's actual chemistry
> involved with the lube business but I've never heard of any of our engines
> dying from oil related issues.
>
> The lead/valve wear thing turned out to be a crock and it's hard to get
> worked up about this oil thing.
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