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peteyshoes · 09-03-2011, 04:15 PM

i use rotella 15-40 in my 42--59ab with no issues. (i use combo weight because truck gets used year round.) as for zinc? there is enough for a working engine, but, imho, not enough for break-in on new engines. suggest a good zinc additive for this.

09-03-2011, 04:15 PM	#4
peteyshoes Member Join Date: Sep 2011 Location: middletown ny Posts: 90	Re: Shell Rotella T 30 wt in flathead? i use rotella 15-40 in my 42--59ab with no issues. (i use combo weight because truck gets used year round.) as for zinc? there is enough for a working engine, but, imho, not enough for break-in on new engines. suggest a good zinc additive for this.