I've been using 5W-30 with a litre of Slick 50 for 235,000 and it runs well. I change oil and filter every 4,000.
SAE 5w20 any major brand.
What oil goes in the transmission? What weight have a rev tech 100?
That is 80 weight.
use the lightest weight oil possible that lets you keep oil pressure.
5W30
According to the 1999 Mercury Sable Owner Guide : For the 3.0 litre , DOHC , " Duratec " V6 engine : With engine oil filter change : ( 5.5 U.S. quarts of 5W-30 engine oil )
10w 30
5w-30 always!
For a 1999 Mercury Sable with a 3.0-liter engine, it is recommended to use 5W-30 motor oil. You can use either conventional or synthetic oil, depending on your preference and driving conditions. Always check the owner’s manual for any specific requirements or recommendations.
5w30
5W30
3.9Liters with filter change