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 )
5w-30 always!
10w 30
5W30
5w30
It came from the factory with ( 5W-30 )
3.9Liters with filter change