10-15-2010, 04:41 PM
Join Date: Jun 2004
Location: Austin, TX
1. Marine Deep Cycle batteries are not designed for cranking engines, excessive use for starting will damage them. You don't want to destroy your new expensive marine battery.
2. Jumper cables do not provide good enough connections to transfer the hundreds of cranking amps from the battery to the starter. That's why the engine is turning over very slowly. And the jumper cables will get hot the longer you crank.
At least you know that the engine is turning over, that's a good sign! *thumb up*
I would recommend either putting the marine battery in temporarily (if the cables will mate up but most likely not because marine batteries have commonly different terminals from car batteries) if you just want to start the car.
Or if you have a strong battery charger (with start assist), you can hook it up to the car's battery cables as well (not to the battery) and that might be just enough current to turn the engine over fast enough to start it up.
Otherwise I'd recommend just getting a new car battery. If you want the car actually running to use it, it will need its own battery anyway.
If you already changed the oil, I recommend changing it again after a few days of driving. The new oil will dissolve some of the built up sludge and you don't want that circulating in the engine.
If you want to flush the oil system better, you can do this:
After you drain the oil (warm engine), you can put in two quarts of cheap thin oil (e.g. 5W-20), run the engine for a few minutes, drain the sludge, repeat the procedure with two more quarts. Like I mentioned, don't use expensive oil, you're just flushing the engine.
Then replace the oil filter and refill the engine with 4 fresh quarts.
Hope this helps.