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Originally Posted by Brons2
I would not go over 7500 if it was my vehicle unless I was out of warranty, then in that case I would go whatever distance my oil analysis said that the oil supported.
The extra additive load will not hurt your engine so long as it does not burn oil. ZDDP can be a posion for cats, and the manufacturers have to now guarantee emmissions performance to 120,000 miles. Thus, the lower add packs of the newest API SM/ILSAC GF-4 oils. They are limited to >800ppm of ZDDP. Older formulas had more in the 1000-1200 PPM of ZDDP. Amsoil oil also generally has a very high TBN, which is also good for long drains, and uses a antimony/sodium mix to control foaming.
Anyways, the bottom line is, do oil analysis, and see what your motor likes. Given that I've seen a very good 7500 mile report on Series 3000 0w-30 on a Titan, that would be what I would choose if I was going Amsoil.
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Yes the 0-30 is a bit better, but it's also like $75 a case!
I live in Cali and summer is starting, so I don't have to worry about freezing cold starts or anything like that either, not really even in the winter. I just used plain castrol in my last truck.