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40 Deluxe · 05-19-2010, 04:14 PM

Also, don't forget to worry about the reduced zinc additive in new oils. It still has a lot more than oil fo the '30's and 40's, maybe even '50's, had, but suddenly it's a problem! Just think about all the flatheads and Model A's, etc. that ran for years with re-refined and/or non-detergent oil! Think that stuff had any zinc additive in it? Nope!

05-19-2010, 04:14 PM	#8
40 Deluxe Senior Member Join Date: May 2010 Location: now Kuna, Idaho Posts: 3,779	Re: Transmission Failure due to new oil Also, don't forget to worry about the reduced zinc additive in new oils. It still has a lot more than oil fo the '30's and 40's, maybe even '50's, had, but suddenly it's a problem! Just think about all the flatheads and Model A's, etc. that ran for years with re-refined and/or non-detergent oil! Think that stuff had any zinc additive in it? Nope!