blackjadeboss
GT Owner
- Feb 17, 2012
- 14
I use Rotella T6 Synthetic 5W-40 which is readily available from most automotive supply stores and even Amazon. Would suggest a Motorcraft or the identical Mann filter, not the Fram.
How long with MoTo keep this 3rd blend as the original 5w50 recommended for the Fgt is long gone.
Cars first came out with "A" spec for the FGT and gold top bottles I believe. Same time a black top bottle "B" spec was released for the GT500. First step, A was discontinued ~6 yrs ago, we all ran the B, black top. Now as Beach posted the B has been changed....
…but I don't like the degrading or re-rating and I have also chosen to run Rotella in the stroked Mach 1, 65 vette w ZDDP additive and the 73 Eldo as other "experts" for the other cars the majority of them also run Rotella.
I don't even get a 1000 miles on an oil change in the GT. I move it to the Lexus and finish it off.
The 5W50 motorcraft is THINNER than the 5W40 Rotella in less than 1000 miles. Its down to a 30wt by 2000. This is why many of us will not use the newer Motorcraft. Its only a 5W50 when new in the bottle, not in use. Of course if you don't drive the car, it does not matter much.
RedLine makes a great real 5W50 that does not break down, turns out its too thick for the DOHC motors.