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#1
08-14-2007, 11:58 AM
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| Oil? I have a 1975 140 hp merc i/o. Need to change engine oil. What should I use? Tag on the engine says use 30 wt. A.P.I. type SI. The local merc shop says use Merc 25/40 wt. type SJ; has detergent in it. Should I be using a non detergent oil? What is best? What about additives? Like Hyper Lube. Is that a good idea? The motor has a lot of hours on it and I run it hard in the salt water.  |
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#2
08-14-2007, 12:27 PM
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| Use 30W detergent. Not sure if they are worth it or not, but see no problem with additives... |
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