Thanks for the question. Yes, you can absolutely use Sea Foam Motor Treatment in the oil crankcase of your BMW 2013 316i N13.

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

• 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. To help progressively clean up your oil crankcase, add it before every oil change.

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!

Thanks for the question, Corrie. Here’s how much and when to add Sea Foam in your 2012 Scion XB:

• 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. Add it to fuel like this every 3,000 miles or once a year.
• 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. To help progressively clean up your oil crankcase, add it before every oil change.

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!

Thanks for the question, John. Yes, you can add Sea Foam to the crankcase of a 2014 6.7 Cummins.

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.

Thanks for the question!

I’d recommend changing the oil. The proper treatment ratio is 1 ounce of Sea Foam per quart of oil in the crankcase. You don’t want to exceed that.

Another option is to drain some of the oil, and then top it off with fresh oil to bring it back to the proper ratio. Example: if a vehicle has a 5 quart oil crankcase and accidentally added 10 oz of Sea Foam, drain half of the oil and top it off with fresh oil to get back to the proper ratio.