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  1. M

    Unleaded in 1989 Mercruiser

    Leaded petrol is becoming more difficult to find , can I use unleaded petrol in my 1989 Mercruiser 350 Magnum engine?
  2. M

    OIl gushing out of dip-stick: Now I know why!

    Mercruiser 260 V8 GMC. on my last post I had several useful suggestions: blown piston rings , defective valves , gasket wrong way round etc.<br /><br />Well it turned out that Ihad ded to use a synthetic 0W-50W oil. bad choice..<br /><br />Oil turned out to be too thin not only did it spurt oil...
  3. M

    Mercruiser 260 V8: Oil gushing out from dipstick

    Need Help: Engine 260 V8<br /><br />Oil is gushing out of side vent hole at top of dipstick at medium to high revs. <br />There seems to be a lot of back pressure in engine but compression is fine on all cylinders.<br />This has just happened after cylinder heads had been re-installed after some...
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