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Message: <blockquote data-quote="cam302" data-source="post: 783924" data-attributes="member: 13470"><p>hey guys new here but i work at a lube shop and we use manufacture intervals on every thing the rear diff is due every 12 to 15k with gl5 and an additive or you can use a synthetic and thats good for every 25k to 30k we do not recommend this. for the manual trans in are cars its also due at the same time but if you have a auto you should flush it first at 50k and then every 30 after that. i change my motor oil every 2500 with mobile 1 10w30 full synthetic and my t5 every 15k with gl5 and the additive and same with my rear diff. just because the oil looks good dont mean its doing its job all oils brake down.</p></blockquote><p></p>