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  1. DanOnTheBoat

    Does the antifreeze you use really matter?

    Fair enough, okay then I will probably consider doing it that way, with the plugs out. If i do do it that way Im assuming any antifreeze would work since Im still going to drain it out of the engine? If Im not wrong I only have 2 drain plugs(87 4 cylinder merc 120 inboard).
  2. DanOnTheBoat

    Does the antifreeze you use really matter?

    Yeah I always run my boat in fresh water. Do you do that procedure? Leaving the drain plugs out over winter? If I do drain the antifreeze out of the block wouldnt there be moisture buildup or would it just evaporate or escape through the opening of the drain holes? Just want to do it right...
  3. DanOnTheBoat

    Does the antifreeze you use really matter?

    Yeah temps here in Ontario get below 0 probably around -25 *C on a coldest winter day. Is this any better?
  4. DanOnTheBoat

    Does the antifreeze you use really matter?

    Got it so it doesnt really matter which antifreeze I use? I could just drain the block but I want to be extra sure that there wont be any water in there that could freeze. My boat is around 35 years old but the motor runs like its new. Don't want to risk ruining a good motor... So would it be...
  5. DanOnTheBoat

    Does the antifreeze you use really matter?

    I live in Ontario, Canada, where temperatures can drop as low as maybe -25°C on the coldest days. I've watched several videos where people winterize their engines by first warming them up and then draining all the water. To ensure no water is left behind, they use an air compressor to blow out...
  6. DanOnTheBoat

    Does the antifreeze you use really matter?

    So bought antifreeze to winterize my boat this year. It's the winterproof all purpose -50 pink antifreeze. As I was reading in the side label of it it said that it's OK to use it for boats... a few lines away it stated "This product is not designed as a heat transfer fluid for closed loop...
  7. DanOnTheBoat

    What oil should I use?

    Okay ill go with the rotella, seems like a lot of people are using that oil without a problem.
  8. DanOnTheBoat

    What oil should I use?

    Rotella makes marine oils? Or are all of those brands for cars? Found Rotella 15w-40 T5 oil. Would that work for a 87 I/O 120hp merc motor? Found this...
  9. DanOnTheBoat

    What oil should I use?

    Sounds good Ill go with the 25W-40 that I found online. Rated for inboards and outboards. Would any harm be done if I run regular full synthetic car oil in my inboard? Or are they different oils?
  10. DanOnTheBoat

    What oil should I use?

    So... looking to change my boat engine oil this year before winterizing it. What oil should I use? I have a 4 cylinder 2.5, 120hp merc inboard/outboard engine. Its an 87. It has an oil cap on it saying 10W-30. I looked online to see what comes up, I found few online a Quicksilver to be specific...
  11. DanOnTheBoat

    What is the right jet for my engine?

    So I have a few spare main jets for my carburator for 120 Merc. Right now I have #70.9 jets in carb. Tried to look online to see what the factory jet is for the engine carb and can't seem to find it. Figured i'd try and get advice/help here. What is the factory main jet sizes for the Merc 120...
  12. DanOnTheBoat

    1987 2.5L Mercruiser inboard/outboard

    Yeah I can tell quality wise there's a big difference with the OEM one. Mine is basically brand new it has less than 10 hours of use on it. I opened it up today and it looked clean inside. I tried installing the OEM carburator and it completely flooded my engine with gas. Had to take out the...
  13. DanOnTheBoat

    1987 2.5L Mercruiser inboard/outboard

    Yeah, it was around $200 don't know if that matters. It wasn't anything cheap. I know OEM is obviously better but what is the difference? The new carburator that I have installed right now works great and has consistent gas flow.
  14. DanOnTheBoat

    1987 2.5L Mercruiser inboard/outboard

    It has an aftermarket carburator. I still have the OEM one.
  15. DanOnTheBoat

    What gas do I use in my boat???

    Appreciate the replies guys. Would using higher octane be better for the engine? If I use Octane 93 in my instansce, or would that make no difference?
  16. DanOnTheBoat

    What gas do I use in my boat???

    Hi guys, I'm a new boat owner and I still have the question to what is the right gas that I have to use in my boat. I know that I should be using ethanol free gas but where I live here in Ontario, Canada, they don't have ethanol free gas... I have a 1987 Mercruiser 2.5L in my boat and the last...
  17. DanOnTheBoat

    1987 2.5L Mercruiser inboard/outboard

    Hm okay, I'll definitely look into the fuel. I filled it up at a gas station with octane 87, I heard it's okay to run mercruiser engines on that fuel but it's bad to let it sit. I live in Ontario, Canada and basically everywhere here the fuel has up to 10% ethanol. Do you think fuel stabilizer...
  18. DanOnTheBoat

    1987 2.5L Mercruiser inboard/outboard

    The thing is I filled the boat up with fresh gas yesterday, I ran through half a tank of it. The engine wasn't running rough or anything it idled and accelerated like usual. I do have a brand new fuel/water separator that i have installed about a week ago, I've removed it yesterday to see signs...
  19. DanOnTheBoat

    1987 2.5L Mercruiser inboard/outboard

    Hi everyone, new here. Also a new boat owner. So I took out my boat, it has a 1987 Mercruiser 4 cylinder inboard engine. I took it out yesterday and drove it for about 45 minutes straight no stopping, was on plane cruising at around 2500ish RPM. I then started to feel and hear my engine slowly...
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