Glad to hear this! I've been using Shell Rotella T4 15W-40 for the last few years on the advise of a stock car engine builder, when I was having lifter issues. He told me these older engines where designed to have zinc in the oil. He uses it for break in oil when he dinos. his race engines also.
Last edited by Chris's 46 / 515; 10/21/2022 2:43 PM.
