W220 S320 2001 I changed transmission oil at 65,000 miles and see an noticeable difference in smoothness of the shift. The oil was of chocolate colour and had a distintive smell to it. I believe that transmission oil should be changed at 60,000 miles.
auto transmission oil should be changed every 40,000 - 50,000 Kms or 25,000 - 30,000 Miles no mater what vehicle it is as oils only have a limited life span. The oil should be changed before it get to the chocolate colour as it then indicates the clutches in your transmission are burning and not engaging properly causing damage.
Per the service booklet for your W220 on page 15, it should have been changed at 40k miles from new. If you have not had it done yet, your vehicle has not been serviced correctly, and you should take it to a different garrage!
Yes it should be!
There is no dipstick to check the transmission fluid on a 1998 Cadillac Catera. It can be checked by opening the fill plug on the side of the transmission. If you are at that point you might as well change the fluid if you have over 70000 miles.
20% of 70000= 20% * 70000= 0.2 * 70000= 14000
Fluids good for approximitly 70000 miles, you shouldn't had removed it
21003% of 70000= 3% * 70000= 0.03 * 70000= 2100
2% of 70000 = 2% * 70000 = 0.02 * 70000 = 1400
I would highly recommend it if it has never been changed. A transmission cooler would also be a great piece to install. They are very inexpensive, easy to install, and can save your transmission from overheating when towing.
70000
Citroen recommend 70000 miles of 7 year, whichever occurs first
70000%
10% of 70000 = 700010% of 70000= 10% * 70000= 0.10 * 70000= 7000
10500= 15%/100% * 70000= 15/100 * 70000= 0.15 * 70000= 10500