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willysmjeeps.com :: View topic - Multi-grade w/Zinc or straight 30w with zinc additive
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Multi-grade w/Zinc or straight 30w with zinc additive
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4x4M38
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Joined: May 30, 2014
Posts: 3440
Location: Texas Hill Country

PostPosted: Mon Jun 25, 2018 8:54 pm    Post subject: Reply with quote

Ralph,
You must have read some of the same articles I did.

I also read of recommendations of higher zinc during break-in,
but also that today’s high detergent oils tend to wash the zinc
off the wear surfaces sufficient to negate the higher concentrations
in the oil.

What a mess......
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Brian
1950 M38
MC11481
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timjuhl
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Joined: Jun 27, 2011
Posts: 262
Location: "Thumb" of Michigan

PostPosted: Tue Jun 26, 2018 7:48 am    Post subject: Geez! No more T3 Reply with quote

What an informative thread. I've used T3 for years so it's cancellation is not good news.
I took the liberty of emailing Shell Technical support and asked the question whether T4 lacked the amount of ZDDP that T3 featured. The answer I got was that Rotella still had plenty of Zinc and was the best mineral oil for older engines. They also sent me a spec sheet, an excerpt of which I've attached.
Tim


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Tim Juhl
1952 M38A1
1946 Aeronca L16A Army Liaison Aircraft
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wesk
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Joined: Apr 04, 2005
Posts: 16225
Location: Wisconsin

PostPosted: Tue Jun 26, 2018 11:27 am    Post subject: Reply with quote

Nice job Tim
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

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cabinfever
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Joined: May 14, 2013
Posts: 201
Location: Between Crosslake and Emily, Minnesota

PostPosted: Tue Jun 26, 2018 12:29 pm    Post subject: Reply with quote

Thanks Tim. That is the kind of information I was looking for. I'll switch back to Rotella for my next oil change.
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Steve Stark - 1955 M38A1 MD #85388

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