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Message: [QUOTE="nitrogen here 2, post: 633095, member: 1120"] its kind of hard to evaluate with so many different engines involved. Any one of them could have had issues internally that could affect viscosity, hours V.S. miles shortness of trips, average operating oil temps etc. Its interesting but not totally definitive. personally 30w is acceptable for all but the heaviest towing in the most extreme heat, neither condition really pertains to me. Something that no one has ever addressed is whether at any point the shearing stabilizes or if it just continues to go down hour by hour. Many factors need to be considered in OCI, amount of dirt, fuel contamination, viscosity, degradtion of other additives. As far as choice of replacement fluid stiction is a major consideration for most of us, especially us Canucks in the great white north. Its interesting, but the only way to KNOW what is right for your truck/driving style is to sample your own oil. [/QUOTE]

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