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Message: [QUOTE="AK1959, post: 1538905, member: 32083"] Old truck with a fairly new 7.3 turbo diesel in it. After two rounds of break-in oil, tried Amsoil Signature Series 15W-40 Diesel Oil. Now, full disclosure, this engine is not stock. That being said, it shredded the Amsoil ( Amsoil is great stuff ) in just 1400 miles. I do not doubt anyone on this forum that their motor prefers brand A over brand B of oil, and the HEUI's are a special breed of motor to be sure. This truck prefers Rotella T6 15W-40. It purrs like a really big kitten on the stuff. My oil analysis comes back with flying colors at 3K, so I've made my interval every 4K because these engines like fresh oil. I think the real thing to take away from the forums isn't which oil you [U]shouldn't [/U]use, but rather find one that you're motor likes and stick with it. Do your maintenance religiously if you like your vehicle and want to keep it. Synthetics can be expensive for sure, so if you're on a budget, watch for sales in the parts stores and maybe stock up on a couple of changes worth when your chosen oil is on sale. T6 goes on sale for $20 a gallon pretty regularly (manufacturer's sale). Whatever you use, be kind to your engine and give it fresh oil at regular intervals. That's going to do more for it's life than whatever brand you choose. [/QUOTE]

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