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| #1  06-Aug-2004, 14:06 | |||
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| mixing syth oils is it a totally bad idea or is it ok? I currently have shell adv ultra 4 in the bike (or so they claim  )I have some spare castrol superbike 4 Both are fully synthetic oils. My oil is a bit low and I don't have time to change it for a couple of weeks: if I do a top up, mixing the synths, will it turn to black sludge?   |
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