Thanks for the question!

Yes, you can use Trans Tune in your Altima’s CVT transmission. It won’t hurt anything, regardless of its service history. It will clean up any residues/varnish.

If you’re using it as a pre-flush cleaner, be sure to drive at least 30 miles before changing the fluid.

Otherwise, you can leave the Trans Tune in there for the life of the fluid. It will continue to clean and condition.

Good question, Stephen. You can leave the Trans Tune in there until your next regularly scheduled transmission fluid change. It will clean and condition for the life of the fluid.

Thanks for the question! Yes, Trans Tune is safe for use in all petroleum-based hydraulic fluid.

Thanks for the question, Dave!

Yes, you can absolutely use Sea Foam Motor Treatment in your Optima! It’s safe and effective in that model. Just follow the instructions on the can.

Here’s a little more info on how to use it:

• Sea Foam Motor Treatment in fuel. I like to wait until the tank is low (1/4 -1/8 tank), add the whole 16 oz can, and then drive for at least 10-20 miles before refueling. It’s safe to add a high concentration like that and it works very well for cleaning fuel residues and deposits.
• Sea Foam Motor Treatment in oil. Add 1 ounce of Sea Foam per quart of oil in the crankcase. We recommend adding it 100-300 miles before your next oil change. That gives the Sea Foam enough time to circulate and clean, and it allows all the reliquefied oil residues to be drained away with the old oil.

You could also try High Mileage Motor Treatment. It’s made specifically for stubborn residues and deposits in higher-mileage vehicles. It’s a great cleaner!

In the transmission, use Trans Tune. Just add the Trans Tune to the transmission fluid reservoir.

Yes, Trans Tune is safe and effective in a CVT transmission as long as the fluid is derived from petroleum (most are).