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Mixing brands of oil


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My 2001 ZZR600 is due an oil change and in the past I've used semi synthetic 10w/40 Guardian Rock oil. The place I used to purchase this oil no longer stocks it, I have a opened litre bottle of this stuff left over from last year which is almost full and was thinking of just buying 3 litres of this stuff and using last years left over to do the oil change. I could buy this oil of the internet or could just buy another brand from the local shop. So my questions are firstly is it ok to use the opened bottle of oil from last year and secondly is it ok to mix brands as long as I use semi synthetic 10w/40?

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I just put some 5-30w mixed with 10-40w magnetix

also put one of those powerful magnet things on the end of my oil sump bolt. came in the post this morning with my wife's debit card. strangely it's not working. ,,£4 for 5 Damn cheaper than buying the ready made one's.

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