My other thought is that some medications have short term memory problems as a side effect. Is your brother on any medications ? If her is, he could go to www.drugs.com , type in the name of the drug and see if memory issues are a side effect. Finally, is your brother having sleeping problems ?
For some vehicles, you're advised to change the coolant every 30,000 miles. For others, changing the coolant isn't even on the maintenance schedule. For example, Hyundai says the coolant (what many refer to as antifreeze) in most of its models should be replaced after the first 60,000 miles, then every 30,000 miles after that. The interval is every 30,000 miles on some Mercedes-Benz models, but on others it's 120,000 miles or 12 years.
Pour 1 gallon into the fresh water fill. We are now ready for the antifreeze. We usually buy two gallons so we have extra for flushing during winter camping, but in a pinch you can winterize with one gallon. Remember if your water heater is not bypassed, you will need 6 extra gallons of antifreeze to fill it. You need to get RV antifreeze, it is non-toxic and can be used in drinking water systems. We prefer to get the stuff in the rectangular bottles â just because they fit between the toilet and the wall in the bathroom. We use antifreeze for flushing during winter camping (we use only the black tank in the winter).