Mineral vs Synthetic

[noswal_j]

I currently use the XPS mineral oil. Can I just add the syntetic XPS to it? How much better for the engines is the synthetic compared to the mineral?

 

[scooper77515]

You should probably be using the synthetic. Did you empty and flush the system before switching over to mineral?

If not do not start the engine(s) again until you do so.

The mineral oil and the synthetic blends to make a jello, which clogs up the entire oiling system, creating an oil-free situation that will quickly destroy your engine(s).

I did this on accident, when the dealer told me to use mineral oil. I had what looked like seaweed in the tank, and a layer of Jello, then some other gunky oil on top. I had to completely drain, purge, and sucke the system clean, then top off with synthetic.

 

[scooper77515]

Here are a couple pics of what came out after mixing the two oils.

This is just the oil being allowed to flow freely from the tank. A little thicker than this engine is used to...

Then a couple pieces of "seaweed" on the oil pickup...

 

[noswal_j]

Got ya...

I have not added the synthetic to the tank yet. And after reading your reply I won't till I purge the oil system. What differences are there between synthetic and mineral? How much would I benefit?

 

[noswal_j]

Ok, I found since I don't have RAVE valves, there wouldn't be much benefit to go with the synthetic. Thanks fo the reply though Scooper. :cheers:

 

[RFoster130]

If it is the new XPS 2. They claim you can go right to it without dumping and flushing. Says so right on the bottle.

 

[ProbeGT]

If it is the new XPS 2. They claim you can go right to it without dumping and flushing. Says so right on the bottle.

I bought 6 gallons of Quicksilver PWC full synthetic API-TC

I don't know what is actually in my boat. I don't want to flush the entire system. Would it be a good idea to buy 1 litre or 2 of XPS2 full syntech add it to my current oil when I'm very low, and until I really need to put oil again, then I add my Quicksilver synthetic?

 

[unclejay]

Seaweed

I am pretty sure the seaweed pieces you found are not because of the oil, they are pieces of rubber hose which have broken down and gotton into the oil/crankcase. Seen it beofre.

The above synthetic discussion is different for supercharged 4 stroke boats. It has been covered in this forum before.

Generally mixing the two oils does not cause a problem except in high sludge engines (dirty).

 

[daverade]

hey scoop whattya do if you mix them then start it up... how can you purge the system to start over?

 

[daverade]

i think my skis had synthetic in them, pops took em and came back with a half gone bottle of xps..... now im a lil worried!!!

 

[scooper77515]

Drain the oil tank, and hook one of the lines from the bottom of the engine to a wet or dry vac. Preferably not your own, but a neighbor's vac. A neighbor that you don't really like all that much. Or steal one.

It makes a mess out of the vacuum, but it can be cleaned with a lot of elbow grease.

That is the gist of how I did mine.

I just threw away the accordian hose from the vacuum, and bought a new one. Too hard to clean that out.

 

[daverade]

is the return line that goes to the top of the oil tank a good one to hook my neighbors stolen vac to?

 

[daverade]

or even better yet... i have a siphon pump... think i could hook it to the return line and pump all the old mixed oil out before it leads to bad things?

 

[White Horse Island]

I was wondering this too, so thanks for asking! Learned a lot!

 

[daverade]

i guess one way to find out is to try... i get off in an hour and straight to the pump it is

 

[scooper77515]

Drain the tank, then run one hose into a container, and pressurize the other one.

That should work, and be a much cleaner job.

Then clean out tank as best you can, refill with oil of choice, and run the crap out of it to run new oil into all the lines to replace the old stuff.

Be sure you prime your oil system appropriately and all your lines are full of oil before starting the engine.

 

[daverade]

sweet ill let you know how well it splooges out!!!

 

[scooper77515]

Use LOW pressure. I wouldn't run the entire 120psi into it.

You will still need the shop vac. I doubt you will catch all the oil. You will then have to squirt half a bottle of Dawn into the hull, rince, and suck out the soapy/oily mess.

Unless you have good aim and can catch it all.:reddevil:

 

[daverade]

good morning.... i have a siphon pump that will push or pull... i siphoned out the tank then took the red elbow out of the bottom of the tank, (replace rubber ring while doing this)... then unhooked the return line from tank.. hook the pull side of siphon pump to return line, taped a bottle to the push side of the pump... then i pulled all the old oil out of the motor and lines leaving me with a little bottle full of oil, just a little mess in the bottom of the hull from unhooking the tank and lines.... now today i'll get the new rubber rings and install, fill tank, bleed lines... should be good to go....

 

[unclejay]

Dawn ?

Putting soap detergent in the hull is OK just make sure any water you add doesnt rise far enough to get into the engine

Really this is a lot of to-do about nothing. Most 'synthetic' oil is half or 3/4 mineral oil these days anyway. They mix fine, if sludge or goo is forming, it is because of the superior cleaning action, not chemical incompatibility

 

[daverade]

i had to replace my rubber tank rings anyways, and i had put new oil lines in this weekend.... no biggy for me an extra 2 minutes... for somebody with a full tank, f that!!!