Frost said:A few years ago I switched from DINO juice to synthetic MOBIL 1 in my 1988 Sedan Deville (just clocked 300,000 on the Odo). I use MOBIL 1 synthetic in the engine, transmission and K&N filters for the oil and air. Also, LUCAS UCL goes into the gas tank now for each fill up and the LUCAS synthetic auto trans stabilizer was put in this year to help smooth out the shifiting. After that many miles, a little kindness to the tranny won't hurt anything.
I used to use SLICK 50 in the engine/tranny and power steering, but now prefer the LUCAS brand for supplemental slipperiness.
My '88 has been feted by more than a few mechanics for it's continued gliding action at all speeds - and I intend to keep it that way for as long as possible.
I~LUV~Caddys8792 said:I believe the 4.9s love that Rotella 15W40 Diesel oil.
Or is that just the early 4.9's?