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Message: <blockquote data-quote="astroboy" data-source="post: 347898" data-attributes="member: 4527">a. The restricted coolant flow: This is intended by the designer because the coolant takes time to transfer heat. Just like the returning tube for the aircond cooling agent back into the aircond radiator is always bigger in diameter than the outlet hose.b. The oil sump drain bolt is not located at the lowest point of the sump: This is intended to protect the drain outlet from being damaged when being hit by foreign object while the vehicle is being driven, more so for a 4x4 due to the rough terrain expected. In worst case, the drain bolt can be drag out upon such impact and causing lost of engine oil.The N46 drain bolt is at the lowest point of the sump, faced down while the N52 is face backwards.Bitumen is mineral, so mineral oil will end up as bitumen given the right condition while it should not happen to synthetic chemical based oil, I think.. :smokin:</blockquote>